Looks like a wallet corruption issue.

OPTION A
Use a backed up wallet you know was working prior the crash.

OPTION B
1 - Bakup wallet by making a copy of the wallet.dat file somewhere of your choice -- IMPORTANT -- VERY.
2 - Dump all private keys through command line (try dumpwallet first if that doesn't work then try dumpprivkey "yourxcnaddress") - If none work, well seems your fucked as the wallet might irreversibly be corrupted. Pray or contact the devs of the coins.
3 - Once the dump is done delete all the content of the blockchain folder -- ALL -- including the wallet.dat (you have made a backup anyways).
4 - Once the above is done, relaunch the wallet (this will recreate a fresh wallet.dat file), let it synch -- FULLY --
5 - Finally, import the private keys of each address you received coins from and addresses you've created (use the importprivkey command) - All coins should now appear.
6 - Now backup the wallet again so you can use that one in case of future corruption.

That's how it worked for me and a few I've helped.