Menu bar becomes tinted red
This started happening several weeks ago, and I have no idea what's causing it, but every so often my Mac's menu bar will become tinted red in the upper-right area:
The strange thing is that if I take a screenshot it's not there, so I had to use my iPhone and take a photo of it. The problem will go away only when I reboot the Mac, and it will stay away for a few days before it comes back. Never did this prior to a few weeks ago.
Any ideas?
-Brian