The application crashed with an Uncaught Exception Error.
I deleted all the files (including %appdata%) and installed the client again.
Recovering the wallet from my seed was followed by this error:
"Uncaught exception: Error: message encrypted to unknown key, device 0GY.....SRL, len=240. The error might be caused by restoring from an old backup or using the same keys on another device"
Any help is appreciated. (Do not PM me asking for my SEED values).
Looks like I probably just deleted bytes worth 1 BTC... haha always lucky.
Edit2:
Recovering any deleted files from SSD is highly unlikely.
Lost all my blackbytes, lost titan-coins worth approx 1 BTC.
Install the old version from before the update and use backup to restore on the old version. Once successful send all funds to a new installation of the new version on other machine and make a new backup.