Uneven Checker pattern with CS6 during adjustment in layers

[plonk]

Hello,

I just bought a new iMac (2017, OS Mojave) and after installing CS6 I made a trial with with a jpg and dng I shot myself.

In both files, after starting with an adjustment layer (curves) as soon I moved the curve somme irregular checherd patttern apper on the image but not all over the image. See attached.

It repeat with further adj. layers but disappeared completely after flatening the layers. When file is "saved as", no pattern left too.

I had CS6 installed on two others Mac (High Sierra & Mojave) and never had that parasite effect.

No checkers appeared on Camera Raw 9, only after opening adj. layers and won't goes off until flatening or deleting layers.

Any assistance on this issue would be very welcomed.

Thank you.

Etienne

[c.pfaffenbichler · Accepted solution]

Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue? 

[plonk]

Yep it helped, checkers are gone.

Many thanks.