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Navigate to console and type:
walletpassphrase <your passphrase> 100
dumprivkey
Copy a private key, remove all files in ./appdata/roaming/q2c, and run qt app. It creates a wallet.dat with new public/private keys.
Set tax per transaction to 0.001Q2C, then navigate to console and type:
importprivkey <your-private key>
It imports private key from old wallet and rescans all transactions.
OMG, it's even worse now!
I lost many other blocks after entering these commands. Now i don't missing only 12 000 but 88 000 Q2C! Now there are no coins from 8th march and from few other days too.
Please, help me devs!
Do you have a backup of your old wallet (.dat file)? Maybe you should try restoring that wallet.
Check into your wallet whether all addresses are listed there. Do you miss some addresses?
Regarding your initial problem, you probably were out of sync or you mined some orphaned blocks.
But what will be with my coins in new wallet? Should i send all to old account before this? (i have a backup of wallet.dat). I don't want risk to loose all. And I never used that address function of wallet, it's useless for me.
20 out of sync blocks or orphans in a row? I don't think it is possible.
U didn't need old wallet.dat. All coins u have in first wallet are in first wallet. You just import private key from first wallet to newest allowing it to rescan that stuck transactions. To ensure all coins are all right u can check your public key with block explorer. Note although you can see the transactions in wallet history u cann't see them in block explorer, because it guess they are still there as they was, as they are stuck. Replace all u have in appdata/roaming/qubitcoin, create a new clear wallet and import private key of first wallet (second сuts no ice as it within any transaction), then run it with <-rescan>. To verify ur transactions is clear you may send q2c to the clear wallet until importing keys and check will it come.