We would need your Photoshop version and would also need your OS version (Windows 7 or Mac OS 10.9)
I'd wonder if it happens with all files, or just one.
I can give you some generic advice:
Under Help > choose Updates and make sure you are current.
Sometimes the Preferences get corrupted, so holding Ctrl-alt-shift keys on the PC and starting Photoshop should give you a "delete settings" box, and by answering "Yes" you erase the old corrupted settings and hopefully that fixes it.
Uninstall/reinstall is the last idea.
Mac OS 10.10.1
Photoshop CC 2014 2.2 (latest version)
All files that I have tested (about 10)
How do I get to delete setting on mac?
You have to stop being vague. What settings are you talking about? MAC or Photoshop?
Hold down cmd-opt-shift and start Photoshop. The delete settings dialog will come up, answer "Yes".
@joelib I suggested a prefs reset, but gave him the PC commands, he wanted the Mac equivalent.
It worked, thank you... I thought that I had a setting wrong. Wanted to make sure that I wasn't missing something obvious. Thank you for the quick reply and help!
Glad to hear it. It's a very common fix but there are times it doesn't work for everyone.