Bartender (and other addons) addon stopped working

Hello,

Today I was trying to reset my Skada dmg addon. I disabled and enabled it again. When I logged back in, my Bartender addon was gone. My whole UI resetted and I haven't even touched the Bartender addon in the login screen... It's not only my Bartender addon but also some other ones too. They are all enabled, but don't show when I play the game.

I tried to remove all my addons from the AddOns folder and put them back in, didn't work.

Anyone else has had this problem?

Thanks in regards, Heftig