Hi Ghobson,

You are a true wizzard.
I downloaded the release you made and booted up the miners.
And low and behold if found a block, and accepted it!

[2018-01-08 09:33:44] accepted: 1/1 (100.00%), 757.30 hash/s (yay!!!)

And it appeared in my wallet as mined!

Thanks a lot for figurring this out.
And sorry I have not tested it earlier!

I was using the hodlminer-avx2.exe inside the orava bundle

I was running this version of the miner, hodlminer-orava2017v2.
Any chance you could compile a windows binary? I would be happy to test if it is working properly.

Did the wallet rescan and it did his job.

2018-01-04 15:10:30 AddToWallet 221cefce5cd9e32581f513bef0b9938a92430dac37846341eb7db9327eb925e3  new
2018-01-04 15:10:31 AddToWallet 5066a40ac57fc242038a10c4a805571227989e55125a3a324404e805eff0c9dc  new
2018-01-04 15:10:31 AddToWallet 48aedb1c05f618d06741f0b66cb3066b94605cfff84d3a5d45c0fdd6de1c80d3  new
2018-01-04 15:10:31 AddToWallet d25042303a338cf535aa8ffd03f48c8b3eb695ee33bdaca76b001b04b69c9411  new
2018-01-04 15:10:31 AddToWallet 5e6cb639ba458667a9d0f1fc203d525dd0bb06235f52c23a51426a0e7063ba76  new
2018-01-04 15:10:34 AddToWallet b4f3957c635ab56baf6cc12a8360e8c4a02804ed629bf2b02019768f07421879  new
2018-01-04 15:10:40 AddToWallet 41611d6ec2b25a89077a76bd8f915a2b99dedf591dc36f7d65519193c184ac41  new
2018-01-04 15:10:44  rescan                29032ms

Booted up the miners and found 2 blocks again..

2018-01-04 16:08:05 UpdateTip: new best=000000fa68809143c4347ed6799d6888c3e545f8365435cbd4d70e3116530234  height=34938  log2_work=39.200781  tx=59333  date=2018-01-04 16:07:41 progress=0.999991  cache=0.0MiB(37tx)
2018-01-04 16:08:05 Block:CBlockIndex(pprev=0xb8f1e00490, nHeight=34938, merkle=6e95b201ee0e5ce5e9e0e5119d31cf074345d491488144de9fa4a716d1ff57b1, hashBlock=000000fa68809143c4347ed6799d6888c3e545f8365435cbd4d70e3116530234, nNonce=1193, nTime=1515082061, location=10237, finalcalculation=4134265587)
2018-01-04 16:08:05 Creating Block...
2018-01-04 16:08:05 CreateNewBlock(): total size 1000
2018-01-04 16:08:05 CreateNewBlock(): nfees 0
2018-01-04 16:08:05 Created Block with miningaddress
2018-01-04 16:08:06 sort earnings flag = 1
2018-01-04 16:13:03 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-04 16:13:03 ERROR: ProcessNewBlock: AcceptBlock FAILED

2018-01-04 16:51:17 UpdateTip: new best=000000e297d92c20d25a59e2b1b6314e0f63fa5adbd038c9315868f2bb0e28f1  height=34957  log2_work=39.201109  tx=59355  date=2018-01-04 16:50:52 progress=0.999990  cache=0.2MiB(808tx)
2018-01-04 16:51:17 Block:CBlockIndex(pprev=0xb8f6c95930, nHeight=34957, merkle=8d297b0c212279fe19af4931af615e59e128cce56fe3c8887f82954cdfe96ba6, hashBlock=000000e297d92c20d25a59e2b1b6314e0f63fa5adbd038c9315868f2bb0e28f1, nNonce=309, nTime=1515084652, location=132654, finalcalculation=1099234819)
2018-01-04 16:51:17 Creating Block...
2018-01-04 16:51:17 CreateNewBlock(): total size 1000
2018-01-04 16:51:17 CreateNewBlock(): nfees 0
2018-01-04 16:51:17 Created Block with miningaddress
2018-01-04 16:51:18 sort earnings flag = 1
2018-01-04 16:52:13 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-04 16:52:13 ERROR: ProcessNewBlock: AcceptBlock FAILED

So again both blocks found were not accepted.
And since I am not the only solo miner having this problem... It can't be just all me ;-)

I am willing to try anything else, and boot up the miners and see if it works.

Did check the blockhash, and it is exactly the same as above.
Put all the network nodes from the blockexplorer in my ROIcoin.conf.
And have now 12 connections to the network.

In good faith started up te miners, eager to see if it would work this time.
So I let them run for a while. They found two blocks, and again both blocks got rejected.

2018-01-04 13:39:14 UpdateTip: new best=000000a3384c408671f5257512e4c27df2e9e8373d110b6ec9a714874d777921  height=34895  log2_work=39.199241  tx=59287  date=2018-01-04 13:38:36 progress=0.999985  cache=0.1MiB(269tx)
2018-01-04 13:39:14 Block:CBlockIndex(pprev=0x5a97dcc4a0, nHeight=34895, merkle=adb04cce2e4435c6bc633432be50bee32a0c56244dc6b7150e42277dc87bf945, hashBlock=000000a3384c408671f5257512e4c27df2e9e8373d110b6ec9a714874d777921, nNonce=3112, nTime=1515073116, location=86907, finalcalculation=2346337573)
2018-01-04 13:39:14 Creating Block...
2018-01-04 13:39:14 CreateNewBlock(): total size 1000
2018-01-04 13:39:14 CreateNewBlock(): nfees 0
2018-01-04 13:39:14 Created Block with miningaddress
2018-01-04 13:39:16 sort earnings flag = 1
2018-01-04 13:40:43 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-04 13:40:43 ERROR: ProcessNewBlock: AcceptBlock FAILED

Shut down the miners after the two failed blocks found.
Guess I am going to reconfigure them for a pool or something. Or just give up on cpu mining ROI

If you read a couple of posts back you see a lot of us have issues with mining this coin.
I stopped mining until we have an answer if it is fixed. Or how to fix it.
No need in wasting cost for rejected blocks.

Still can't solo mine this coins.
From the around 6 or 7 blocks found this evening... every one got rejected.

2018-01-03 20:39:44   nActualTimespan = 2898  before bounds
2018-01-03 20:39:44 params.nPowTargetTimespan = 1200    nActualTimespan = 2898
2018-01-03 20:39:44 Before: 1d757750  0000007577500000000000000000000000000000000000000000000000000000
2018-01-03 20:39:44 After:  1e011bae  0000011bae383d70a3d70a3d70a3d70a3d70a3d70a3d70a3d70a3d70a3d70a3d
2018-01-03 20:39:44 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-03 20:39:44 ERROR: ProcessNewBlock: AcceptBlock FAILED

2018-01-03 21:41:07   nActualTimespan = 1080  before bounds
2018-01-03 21:41:07 params.nPowTargetTimespan = 1200    nActualTimespan = 1080
2018-01-03 21:41:07 Before: 1e01ab69  000001ab69000000000000000000000000000000000000000000000000000000
2018-01-03 21:41:07 After:  1e0180ab  00000180ab4ccccccccccccccccccccccccccccccccccccccccccccccccccccc
2018-01-03 21:41:07 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-03 21:41:07 ERROR: ProcessNewBlock: AcceptBlock FAILED

Perhaps will remove and reinstall wallet again... perhaps it might help...
Dunno... Or I'll just stop mining and try to find some other coins...
And it's not that it was not working.
Found arround 20 blocks in the days before 1 Januari.

If someone has a suggestion on how to get this going properly, please let me know...
Else I have to go to the pool... And thats less profitable for me.

Thanks for any help!

Just restarted the wallet, and am now 27 blocks behind.

It means your discovered blocks are not being accepted.
I also have this problem. Stopped mining for the time being.

Last 100 blocks found went to the pool anyways... Because there are 2 payouts, and one is the 1% fee.

Ultimately its up to you.
I personally stopped all mining for now.

I think we have an unsuspected fork happening.
Must also explain why all of my mined blocks yesterday got rejected.
Just took some time to run out of sync and show up clearly.

I think something wonky is going on..
Today I booted up the wallet and waited for it to synchronize.
After complet synchronize it told me it is on block 33520 so I checked with the explorer and it told me it was on block 33540 so a 20 block difference.
I am connected to this peer 52.211.179.241:3377
Any clue what is going on?

DO you want to solo mine?
Then I suggest you follow what I have written above.

If you want to mine to cluster or pool (pool is not functioning correct today)
you have to input your wallet address in the bad file, and use the config outlined on the cluster website or the pool website.

If you remove -q -D  from the bat file it will show you hashrate.
-q silences output -D is a whole lot of debug information.

If you want to mine with a certain set of cores you can't do it from withing the wallet shut down the wallet.

You have to make a ROIcoin.conf file with:

rpcuser=mine
rpcpassword=miner
rpcallowip=0.0.0.0/0
rpcport=23110
rpcthreads=40
server=1
daemon=1
gen=0
miningaddress=PUT_YOUR_RECEIVING_ADDRESS_HERE

RPCport = 3377
addnode=99.198.174.212
addnode=188.226.134.103
addnode=178.62.105.207
addnode=46.101.241.241
addnode=46.101.139.91
addnode=52.211.179.241

Save this file in the data directory, if you left it default during install it is in %appdata%\ROIcoin

Next download a miner, you can get one from: http://roicluster.miner-pools.com/

Extract the files and create a bat file for you miner:
roiminer.exe -a hodl -o http://YOUR_IP_ADDRESS_Here:23110 -u mine -p miner -t 4 --coinbase-addr=PUT_YOUR_RECEIVING_ADDRESS_HERE -q

The -t 4 is the number of cores you want to assign, so in your case you would want to change it to 2.

Since I did a reinstallation of the wallet, and deleted all the files exept the wallet.dat and the ROICoin.conf
I have had 11 failed found blocks in about 2 hours. So yes, everything I find across those 4 mines are marked as failed, since yesterday evening
In mather of fact I havent had a single Block since yesterday evening, so for about 22 hours not a single successful block found.

I don't know what those connection errors are, but my nat, firewall and windows firewall are good to go ;-)
The miners just connect fine and since last night nothing changed on the firewall or nat config.

I am willing to provide my receiving address in an email, or other means, so you can check I was just solo mining fine.

Cool! Thanks I found the debug.
Here is a portion of the logfile where the block failed to create:

2018-01-01 18:31:40 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:31:42 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:31:42 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:31:43 socket recv error An existing connection was forcibly closed by the remote host.  (10054)
2018-01-01 18:31:55 UpdateTip: new best=000005400a98ea88289b7e82d1ee370c0763307c88a72c1aec05e98ba39944d5  height=33224  log2_work=39.161193  tx=57326  date=2018-01-01 18:30:24 progress=0.999963  cache=0.0MiB(163tx)
2018-01-01 18:31:55 Block:CBlockIndex(pprev=0xe5d1da0a0, nHeight=33224, merkle=9a1d2a5b1702f790400f83378d23e80736e5a7830141e2d7709f05c222af83da, hashBlock=000005400a98ea88289b7e82d1ee370c0763307c88a72c1aec05e98ba39944d5, nNonce=15, nTime=1514831424, location=170093, finalcalculation=1050706621)
2018-01-01 18:31:55 Creating Block...
2018-01-01 18:31:55 CreateNewBlock(): total size 1000
2018-01-01 18:31:55 CreateNewBlock(): nfees 0
2018-01-01 18:31:55 Created Block with miningaddress
2018-01-01 18:31:56 sort earnings flag = 1
2018-01-01 18:33:17 UpdateTip: new best=000003defb5d70702d478a84dedcafd76b79af79ad53284e896b6e7fe1a84b70  height=33225  log2_work=39.1612  tx=57327  date=2018-01-01 18:31:58 progress=0.999968  cache=0.0MiB(164tx)
2018-01-01 18:33:17 Block:CBlockIndex(pprev=0xe5d1da140, nHeight=33225, merkle=ebf50339152f52f9261560df3ff1d62b258a86eff5460e1c68d6ab34b06aebda, hashBlock=000003defb5d70702d478a84dedcafd76b79af79ad53284e896b6e7fe1a84b70, nNonce=16, nTime=1514831518, location=114318, finalcalculation=690435665)
2018-01-01 18:33:17 Creating Block...
2018-01-01 18:33:17 CreateNewBlock(): total size 1000
2018-01-01 18:33:17 CreateNewBlock(): nfees 0
2018-01-01 18:33:17 Created Block with miningaddress
2018-01-01 18:33:18 sort earnings flag = 1
2018-01-01 18:33:29 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-01 18:33:29 ERROR: ProcessNewBlock: AcceptBlock FAILED
2018-01-01 18:33:49 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:33:51 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:33:56 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:34:49 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-01 18:34:49 ERROR: ProcessNewBlock: AcceptBlock FAILED
2018-01-01 18:36:03 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:36:07 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:36:08 socket recv error An established connection was aborted by the software in your host machine.  (10053)
2018-01-01 18:36:29 Creating Block...
2018-01-01 18:36:29 DEBUG: TXID: fc29737ec6def0d4b9b1d42e393fa2bd247943d03115f1ae594899f62edea64c nHeight: 33226 nTxFees: 0 vout: 12009798258 TX: CTransaction(hash=fc29737ec6, ver=1, vin.size=1, vout.size=2, nLockTime=33225)
    CTxIn(COutPoint(d1562f18c9, 0), scriptSig=3045022100db29b44733241a, nSequence=4294967294)
    CTxOut(nValue=100.00000000, scriptPubKey=OP_DUP OP_HASH160 c538b15616da)
    CTxOut(nValue=20.09798258, scriptPubKey=OP_DUP OP_HASH160 575250a77c52)

Could you please tell me how to get the on screen debug output to a log.txt file?

Nope I solo mine.
I have a central wallet on a low watt server.
And have 4 machines with 20 treats each mining and getting work of the central wallet server.
All the machines who connect to the central wallet, report blocks found, but since last night everything gets rejected.

If your interested I can send you the central wallet config file and output from a debug windows on a miner.

Well, I did a fresh install of the wallet.
Checked the blockchain number in the wallet, checked the blockchain number in the explorer. They were the same.
Turned on the debug in the miner, and checked it was running the correct blockchain number, the one in the wallet +1

But I still get: [2018-01-01 18:18:27] accepted: 0/1 (0.00%), 888.54 hash/s (booooo)
[2018-01-01 18:37:17] accepted: 0/1 (0.00%), 981.51 hash/s (booooo)

So I guess something else must be going on!