I currently have a file that has a yellow square that indicates there is 1
warning... yet in the error bar, there are no tick marks at all. I cannot
find the location of this alleged warning, in order to try and fix it.
I haven't tried shutting down and restarting to see if that clears it up yet
(I'm in the middle of working on the file, and a shut-down/restart is a
several minute chore), but I wanted to report it. Very odd.