I tracked this down and the list item display is now fixed. There is still an issue with the search paths not being loaded when the core settings are loaded.
I just added log level saving/loading from gui prefs.
Reverting the fix works. Looks good on Tk 8.4 and slight blink sometimes on 8.6 on mac, but not a big deal.
This is intended behavior from the root menu. I tried it this way and it's pretty *annoying.*
I fixed the highlight selection by making sure the active item in each new listbox is actually highlighted. This is much easier to follow and complements the black focus rectangle. Also, the highlight is now removed by deselecting the entry when moving to the left.