Hi there!

Just having a weird problem since the start of Dragonflight : I have some weird "default UI" that are appearing (not even the new Blizz UI) in arena : https://imgur.com/a/vhJRoCz

I have checked both options in "Blizzard Raid Frames", and they only disappear when I uncheck, check them again then reload UI (tried to only reload UI, doesn't work).

Here is the fstack : https://imgur.com/a/CT8vi8S

My guess would be some ArenaEnemyPrepFramesContainer coming from ArenaUI.xml but I'm not so sure

Grid2 does not try to hide arena stuff. only blizzard raid and party friendly frames.