If you're having wallet problems (and this sometimes works with other coin wallets too) save a copy of the 'wallet.dat' file and delete the whole roaming|copypasta folder then restart the wallet and let it sync again. To speed up the syncing install the bootstrap file - see OP.

For safety I either rename the copypasta folder something like 'copypasta_OLD' or save a copy of the whole folder, before deleting anything.

I've been using the wallet for quite a while now and it's worked just fine; as my mining rig is on 24/7 I've got copypasta staking full time on the mining rig.