Please try unchecking graphic processor in the preferences.
Click Lightroom -> Preferences -> Performance
Uncheck Use Graphic Processor
Close Lightroom and re-open it.
This problem is caused by a hardware malfunction.
If the same photo shows the problem in different locations as you open and close and re-open Lightroom, the most likely causes are a malfunctioning hard disk, or bad memory chips.
@Jitendra. I tried that but it didn't work.
@dj_paige. I opened that picture in Photoshop and the problem was there as well... But it is strange, that it only occurred after I upgraded to Lightroom CC
As I said, this is almost always a hardware malfunction. You need to check your hard disk for errors, and your computer memory for errors.
Any suggestions at what programs to use?
No, not specifically, I haven't needed to do that recently, but I'm sure your favorite search engine will find programs that can check your hard disks and memory for errors (and I'm sure others in this forum will have suggestions)
Memtest86 is the usual go to memory testing software.
If your HD features S.M.A.R.T technology you should be able to view this info in Windows.
Otherwise you can install a trial version of HD Tune to test it. Or you will find that most drive manufactures have diagnostic software free to download.
Warning, stressing a flaky HD can cause it to fail.
Thanks for the support!