Seems to be version 3.3.7367 on a fresh installation of Windows as of last night
Is that a full install, or a Store version?
Personally I would advice to use a portable install in a folder outside Windows' controlled/monitored folders.
Preferably on another partition if available.
Secondly, if you want a player mainly to just use as a folder player, I am not sure MusicBee would be the best choice.
But would any of that change the behaviour of the flashing or is that just a personal setup choice? But I think I'll just go back to Foobar.
Thanks for the replies.