Hi , I have been encountering this issue for 6 times after 6.0 launched , the crash will happen when you are loading something(e.g.A map , a story scene..) and you will never be able to load the some content unless you reinstall your game. Then you will be able to load the thing , but this error will happen sometime somewhere again.

In this case , if you reinstall , you will be able to access to Uldah again , but at some point when your game load sth , it will crash and you need to reinstall again.

Apart from that , you can try to right click your character and go to another world on the character selection page when you log-in , you will be entering one of the 3 starter city, and you will be able to play without crashing , but if you try to teleport to Uldah again , your game will crash again.

There is no REAL fix on this and SE has been very quiet on these random DX11 errors.