Many odd issues can be resolved by resetting your Photoshop preferences.
The main preferences file is called "Adobe Photoshop CS6 Prefs.psp".
Once you find the file, save a copy to include in your bug report, then delete or remove it from the preferences folder.
Photoshop will create a new preference file the next time it is run.
Under Windows XP the preference file will be found at:
%windir%\Documents and Settings\[username]\Application Data\Adobe\PhotoshopCS6\Adobe Photoshop CS6 Settings\Adobe Photoshop CS6 Prefs.psp
Under Vista and Windows 7 or 8, the preference file will be found at:
Users\[Username]\AppData\Roaming\Adobe\Adobe Photoshop CS6\Adobe Photoshop CS6 Settings\Adobe Photoshop CS6 Prefs.psp
On MacOS the preference file will be found at:
/Users/[Username]/Library/Preferences/Adobe Photoshop CS6 Settings/Adobe Photoshop CS6 Prefs.psp
PLEASE NOTE: On MacOS 10.7 and later, Apple has hidden your Library folder, so you may need to make it visible - but the location is the same for all MacOS X versions. Instructions for accessing hidden user library files: Access hidden user library files | Mac OS 10.7 Lion
If you need a quick and dirty way to restore your preferences, here's a way you can do it using a keyboard shortcut on launch:
Windows - CTRL-SHIFT-ALT immediately after you double-click the PS icon.
Macintosh - CMD-SHIFT-OPTION immediately after you double-click the PS icon.