Black region appears over menu bar in slideshow mode

We have occasionally received reports of a black region appearing on top of the menu bar while in slideshow mode in Mental Case for Mac. Unfortunately, we haven't ever reproduced this ourselves. It seems to relate to specific laptop machines.

However, there have been reports that this may relate to iStat and other menu bar extensions. If you are experiencing the problem, please try quitting iStat and restarting. If it does indeed stop the problem, make sure you are using the most recent version of iStat, and if the problem persists, contact their user support to report the issue.