Repeat Error CTD

Server Frostmane
So I have been having issues since installing the latest update. It freezes or crashes to desktop (CTD) with the error message below...

Error #134 (0x85100086) Fatal Condition!
Program; C:\Mist Of Pandaria 5.4.2\Wow.exe
ProcessID: 2352
Unknown Error Code: 2232418457 (0x85100099), 38
Press OK to terminate the application

Any ideas?

It usually happens when I have killed something and the npc is glittering like it is ready to be looted but will not allow me to. It last happened in the mines around Brunnhildar village. 1% of the workers were yielding any loot, the rest were unlootable.

Im having the same issue each time i try killing manifestation of Sha.