Thanks for your reply. It concerns Photoshop CC. I import my pictures to Lightroom 5 and open them to edit in Photoshop CC. The problem of Photoshop quitting actually occurs when changing foreground or background color. It occurs after selecting the brush tool, but also with the eraser tool. So every time I try to pick a color using the set foreground color tool et cetera, the program quits completely and I have to start Photoshop again. At first I received a error discription, but not anymore. What do you mean with OS version?
In addition to the above, just found another problem report window left on my desktop that appears after PS quits. It says: Photoshop quit unexpectedly. Click reopen to open the application again. This report will be sent to Apple automatically. And a load of text under the 'show details' button.