after upgrading to latest version and restarting a few times i got this error mentioned. reinstalling (without uninstall) worked but only till i restarted the client the next time.

then thought id try deleting the file in database folder, this worked too, and lasts client restarts

also using an older version pre qt worked too, infact i have them both in the saem install as i didnt uninstall pre-qt version b4 installing qt version.

there's something about seeing the confirm numbers ticking over as your block chain updates that i miss from the old client.... ;(