Os version? I cannot reproduce this. Could be preferences, any number of things. Try restarting Photoshop & holding shift key down immediately to turn off plug-ins. This post has a ton of excellent ideas: Photoshop: Basic Troubleshooting steps to fix most issues
I'm having this same issue. Can't close an unsaved file that has been opened, even if it is completely unedited. When an unsaved file is present, I can't quit Photoshop, either.
I'm on OSX 10.7.5 (yes, I know...it's aged), Photoshop CC. Plenty of memory and disk space, so that's not the issue.
Any ideas? Thanks!
I am also having the same issue...
Photoshop 2014.2.2 release
Same issue after installing CC with purchased Photoshop CS5. Windows 8.1, Lenovo Y50 i7 processor, 16gb memory, Samsung 500gb SSD.
I've recently started having this issue as well. I'm running PS CC 2015 r1.2 on Mac OSX 10.11 (El Capitan).