For example
http://forums.codeblocks.org/index.php/topic,24183.0.htmlIt is a known bug, but few people lurking here uses MacOS/knows enough about programming/want help to test or fix this bug and others.
The questions about the gray box in MacOS started about a month ago, and all OP use Catalina. I don't know details, but possibly Catalina changed something in wxPoupWindow, or the wxWidgets library used in Catalina has some issue with popups.
Recently, changes in wxWidgets' popup code in MSW broke C::B code completion in two unrelated points, one was solved skipping wx3.1.2 entirely and the other needed a patch for C::B.