BUG REPORT
I use Windows 7 x64. I have a very powerful machine, 32GB blah blah blah
Using Photoshop CC 2014, while in cropping mode and attempting to zoom with keyboard CTRL+ and CTRL-, I got an error pop-up and a severely botched document display:
http://i.imgur.com/Ge9IE3h.jpg
http://i.imgur.com/RhvWvdh.jpg
My performance settings: http://i.imgur.com/Sjvkd25.png
PS didn't crash. I simply clicked ok and it recovered. But it kept doing it while trying to crap. Though, it didn't prevent me from cropping.
This is the original image PS is trying to display: http://i.imgur.com/WqFS5sf.jpg