Try opening up the whitecoin wallet (basically a mintcoin clone). Then go back and try the mintcoin wallet. If that doesn't work, backup your wallet.dat file and then delete everything and do a fresh install from scratch. Once the wallet is fully synced, replace the wallet.dat file with your backup.
Another option is the to try the salvagewallet command.
From Reddit:
http://www.reddit.com/r/MintCoin/comments/2r0jcn/mintcoin_114_wallet_not_responding/cnjwsgwOk, Running whitecoin wallet works!!!
Finally... thanks!
I'm
really curious as to what causes this/why this works. I am having a hard time wrapping my head around this. Anyone have any ideas? Just idle curiosity, mind you...
It happens when your computer shuts down with the wallet open... or if you shut down the program in an unexpected form...
When it happens and you come back to the wallet, the news section on the right seems outdated, like with different links..
Now, why opening whitecoin wallet fixes it is beyond me..