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I've heard about that problem as well, and according to the adobe forums it's due to being a version of PS CS thats not quite... how do i bring this not too bad... legal.
There are solutions for it, but i'm not capable of finding any (but you can search for something)
mightbe you can try to reset the preferences file?
(taken from the adobe user forums)Background: Sometimes Photoshop can exhibit odd/erratic/weird behaviour. This behaviour can sometimes be overcome by removing the Photoshop Preference file. The procedures outlined below are the most common methods of removing the preferences file.
Q: I am experiencing weird behaviour in Photoshop. - How do I delete / reset my preferences?
Photoshop Versions 6x and later:
A: Hold down Alt, Ctrl, and Shift keys (Mac: Command, Option, Shift) while starting Photoshop. A dialog box will appear asking if you wish to delete the preferences file.
A2: You can also simply search your hard drive for a *.psp file and delete it. It will be called something along the lines of "Adobe Photoshop X Prefs.psp".
Under Win 2k/XP the preference file will be found at:
%windir%\Documents and Settings\~username\Application Data\Adobe\Photoshop\[version #]\Adobe Photoshop [version #] Settings
[NOTE: You need to set Window's Explorer Options to "View Hidden Files and Folders" to display the Preference file]
Mightbe it will help you with your keysettings. And there is also an option to re-assign your keyboard shortcuts, so you can assign the ctrl function to another button.