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Hi, noob question here. I previously bought a few tickets with success and earned some subsidy but now the wallet says I have insufficient funds to buy a ticket while I have enough spendable DCR in my wallet. Any idea what I might be doing wrong/is going on?

I would think if it says spendable, then you should be able to buy tickets. Try closing and restarting your wallet as it sometimes needs this to refresh. Also it takes 256 blocks (~1 day) for your stake reward to be returned and spendable.

Thanks, I guess although it says my DCR are spendable it needs more blocks to pass before I can buy tickets again. It now says need expiry beyond next height....

I am facing similar problems regarding stake mining / ticket purchase:

It worked quite fine for me during the last few weeks but recently two strange things keep happening:

1. I have the funds (108 DCR) to buy 3x tickets @ 33,12 DCR (it shows as "spendable" in my account). But when I try to buy 3 tickets I get an error "insufficent funds". Even for two tickets I seem to not have enough. I can only buy one. Why is that?!

2. Often I buy a ticket and and a few hours later the DCR I "spend" to buy the ticket are back in my account and I don't have a mining ticket. Huh

Thanks for any help.

1. After a ticket is voted and you get your Decred back + the POS reward, the coins are blocked by 256 blocks (~ 20 hours). There is a bug that will be fixed in the next release that shows these coins as spendable before they are.

2. Unfortunately the fee you offered wasn't enough to win the "ticket auction". Your offer was accepted, your coins went to mempool, waiting for your offer be bigger to take the tickets, which didn't happen. By that they returned.
In the "Expiry blocks" field you enter by how many blocks you want your bid to compete. Comes with 16. I recommend that you put the total number of blocks for the round to end. Your chances are higher with a lower fee.
To know how many blocks to finish the round just look at "Blocks until retarget"

Thanks a lot for the detailed explanation.

One more question about fees: Let's say the avg. fee (https://dcrstats.com/) is 0.5 DCR. I read that a ticket->pool uses 0.5 KB, so should I use 1.0 DCR as fee to compete with the avg? That seems very high.
Also https://dcrstats.com/ right now shows 0 DCR as average fee, is this correct or is it just not updated yet?

Those fees are reported on a per kb basis... so if the minimum fee is .2... you set your fee to .21 and will pay .21 * .5 dcr.