It's not as simple as "it can only be x" - there's a lot of potential issues. It could be a corrupted jobs.db, or a failing hard drive, bad ram, malware, or you might be using an old/buggy version of Ketarin - or it could be an incompatible OS language or a "broken" app file.   To repair the jobs.db file: You might also want to try a vacuum on the database with SQLite directly: sqlite3 jobs.db "VACUUM;"   To test the drive: install SmartMonTools, then