No preview and no hero panel when you use 4k is a game breaking problem.
You agreed to beta test DX11 so that comes with it. and you still have the option to turn that off.
I'm not as tolerant as you to poorly tested code. I can understand bugs in events, quests, collections' npc behavior and any other in game oddities that really can't ALL be tested prior to every patch.
This is a basic error that broke the game's most basic UI functionality. It's even a commercially disaster since I can't even preview things on the gem store.
What it tells me is that Anet did not fully test the ui fix they made. It seems, so far anything to do with 4k screens and dpi scaling is not tested well by anet.