i had the db error thing pop up on my wallet after restarting the client. I first did repairwallet through the console window, it did indeed find a spent coin mismatch, then I shut down balls client and restarted using -rescan as a flag in the shortcut. the error returned so i deleted debug.log and db.log restarted with the -rescan flag via shortcut and then the message went away along with the checkpoint error. so far been 30min no issues.