Try disabling the Graphics acceleration
Go to Preferences, click on the Performance tab, uncheck the box there
Edit >> Preferences >> Performance
Lightroom >> Preferences >> Performance (on Mac OSX)
Then disable GPU acceleration.
For Windows you should go to the website of the manufacturer of your graphics processor and check for driver updates. After updating you could try switching GPU acceleration on again, otherwise leave it disabled.
On mac GPU updates happen with OS updates.