Quick background - Right Click->Search->Locate in Playlist was working on one install and not the other. I noticed that ""NavigatorPlaylistExpanded" in MusicBee3Settings.ini was different between the two ("false" in the one that wasn't working). I changed it to "true," and the function started working.
I noticed that the function stopped working again, and, sure enough, I had somehow managed to set it back to "false" without having edited the file manually. Changing it back again restored the function.
What setting in MB changes this value (so I can make sure not to change it again)?
Thanks!