Thanks for bringing this bug to our attention!
The checkbox log file is in .cache/checkbox/checkbox.log. It would be useful if you could:
- Remove the old checkbox.log
- Start checkbox from the terminal like this:
- Try to reproduce the problem
- If it does happen, please attach the logfile to this bug report. Optionally, you can use apport-bug checkbox to automatically attach it and add some more useful information.
Leaving as Incomplete.