Hum, this issue has been reported now 3 or 4 times, but people don't seem to know how to reproduce it on demand, do you know how to reproduce it?
It definitely seems to happen with a large numbers of connected status windows..
Previous reports with the same kind of videos:
https://forums.mirc.com/ubbthreads.php/topics/247726/Glitching_the_treebar#Post247726