Youtube unusable in full screen while in theater mode
This morning I noticed that screen would turn blank when switching YouTube player to full screen. Almost caused me to reboot my pc. It appears a bad youtube update caused it where the theater mode would be the cause. Solution: don't use YouTube theater mode in full screen untill they fix that. Use the default mode instead.
Update: Looks like Youtube recently fixed this issue, full screen on theater mode now works again :)