Please turn off the Graphics Processor from Lightroom Preferences.
Go to Lightroom Preferences from the Edit menu
Click on Performance tab
Uncheck the Graphics Processor
Let us know if that helps.
tried that thamks but when I go say into spot healing it just freezes and says not responding
I restarted like you said noticed it has checked the box again for graphics
still not responding with box unchecked
Lets know the Operating system version you are using.
Also, have you tried using the new catalog.
I'm using windows 10 will try a new catalogue