Crash on start D3 Reaper of Souls

I am unable to successfully launch D3 Reaper of Souls -
After the Reaper of Souls logo appears I get a white screen and a crash with this error:

6ADEEDDF-BDDA-43FF-A1C5-02B0EDB35F2D

Hi : You should have posted that on the Technical Support forum… not Bug Report. Blizzard provides no support from this forum.

That long hexadecimal code is an event ID… a number that Blizzard can use to, sometimes, try to figure out what went wrong. It is not an error code by any stretch of the imagination…

Without more details on your system, we’re just guessing as to what could be wrong… current “common” errors are :

Other troubleshooting : Diablo III Locking and Crashing - Blizzard Support including Advanced troubleshooting.

If all of the above fails :