Just wondering if anyone else is having this problem with Photoshop CC, I have done this moodboard several times now and each time this glitch has appeared, both times when scaling up a photo. When I delete this grey striped layer it removes pixels from the pictures on the board and I have to start all over again. It happened to all the psd files that I had open at the time. Does anyone have any ideas/help as this is for a deadline?!
I would start the investigation in Edit > Preferences > Performance with the Graphics Processor Settings.
Your Graphics Card is compatible?
The drivers are up to date?