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You might try a preference reset (not always cleared during uninstall).
Win: Press and hold Ctrl+Alt+Shift immediately after initiating Photoshop's startup. A box will appear asking if you want to continue with the reset, select "yes." If you don't see this, you weren't fast enough...Try again.
Mac: Press and hold Cmd+Opt+Shift then start Photoshop. A box will appear, asking if you want to continue with the reset, select "yes."
Also go to Edit>Preferences>Performance and uncheck “Use Grapics Processor”...Restart Photoshop