If you are unable to uncheck the GPU checkbox in LR / Prefs / Performance then you’ll have to edit the LR preferences file manually using Notepad or Wordpad (write.exe).
On Windows the preferences file is stored in:
C:\Users\-username-\AppData\Roaming\Adobe\Lightroom\Preferences\Lightroom 6 Preferences.agprefs
Look for UseAutoBahn=true and change it to UseAutoBahn=false
Thanks will have a look now
Cant find that under your destination address on the C drive?
Did you substitute "username" for the actual name of your user account?
Right the folder was hidden, done and it works, much appreciated
Seems crazy that we're having to do this, think Adobe need to check their releases more thoroughly!
Fingers crossed for a fix on this GPU bug!!!