After updating LR on version 6.5 my screens flickers while I am editing my photos... With version 6.4 - everything works fine. I also run LR5 and there are also no problems while editing the images.
I also tried to re-install LR and upload it again on my Mac - but still the same problems Can somebody help?
Try unchecking the option Preferences > Performance > Use Graphics Processor.
Thank you! Now it works