Cause: It's likely that you have just recently reset your Qube! database on the same machine that was previously running a Qube! supervisor. The database was cleared, but the job log files are still present. The discrepancy between those log files and what is stored on the Supervisor database is what the QubeGUI is likely issuing these warnings about.
Solution: Delete or move the job log files. They can be found at:
- Windows: C:\Program Files\qube\logs\job
- Linux & OS X: /var/spool/qube/job