Not sure about your sync problems. Have you tried checking that the hash of the most recent block on your "problem" client matches the same block on your fully synced one? (ie, the hash of the highest block on your problem client can also be found on your good one.)
Well, I can't sync more than one wallet now, so I can't know. I have copied the blockchain from one computer to the other, that works, but I can't sync from scratch.
Are the clients on the same machine and OS?
Different but similar machines, all Win7.
Mining at a low difficulty will result in a high reject rate, because your miner finds (and submits) multiple solutions to the same block before the client fully processes the block and the miner is directed to work on the next one.
Ok, so that is nothing to worry about.
Note that all COINO coins have been mined, so although you can create new blocks, they do not have any reward.
Now that explains a thing or two! So the coins you get from ProHashing are bought or from a storage! But I can't send between wallets, is that because blocks are not confirmed?