Hi flowermoron, can you try sending us a copy of your debug log? Hard to know, but there might be some hints in there.
1) Enable advanced debug logging from the Troubleshooting menu in About
2) Reboot
3) Recreate the problem several times, to ensure the problem is captured. Change resolutions, restore backups, etc, do whatever causes the problem a couple times over.
4) Use "Create an error report package" to get the report to us.
Thank you for your help!