Hi,

When running on HiDPI, the Window List thingy gets corrupted when you have many windows open.

The result is a second, tiny, set of window buttons overlaps part way above of the normal sized bar. At this point, the buttons on the normal size bar are no longer functional.

A good example is here:
https://user-images.githubusercontent.com/961604/42700378-dd731c2c-86c3-11e8-97c9-fd5f46d30446.jpg

Details of the issue have been discussed and a fix presented here: https://github.com/mate-desktop/mate-panel/issues/818

"If you run into this error in other distros file out a report there and ask maintainer to build the panel with wncklet and clock applets in-process.
Any way, real fix will come with gtk+-3.24.0/3.23.1"

I appreciate your consideration.

Thanks!
Mark