So I was messing around with the supercell effects I mentioned before, when I noticed the option "Run Performance Test". I had no idea what that did, so of course, curiosity kills the cat. Or compooter. No one cares.
Except me. I clicked it, and the UI disappeared. After a few seconds, US2 slowly and scarily faded to black, and I was left with a computer that didn't display a cursor while being frozen at the same time. That's the worst combo ever.
Unfortunately, I can't attach a log, since I had to restart my computer to fix everything. Note that the shutting down of my computer also took about a whole minute because of the bug.
EDIT: I found the log, but I refuse to attach it (at least publicly) since for some reason the log file has to include my real name.