I don't use the one from the store. I'm currently using two versions because of this. One portable which has the latest update (3.3.7310 P) and one that i have installed through the installer (3.06276).
Something changed after the drop and drag functionality changed.
I can drag normally to mp3tag or Picard or foobar. I can drag and drop from the updated portable version to the old MB install, but not the other way around.
I haven't contacted Jaikoz, because nothing changed with Jaikoz at the time, it was after the MB update in the past which changed the drag and drop funcionality (which was most notable because of the icon you get presented once you start to drag and drop). I can drag and drop perfectly from the older version i have installed to every other app i use.
I also need to note that the exact same problem occurred with the the updated install version.
I posted in this forum before when this problem first started to arise, which was in 2017
https://getmusicbee.com/forum/index.php?topic=21740.msg127485#msg127485 , but i didn't get any reaction to this.