My PhotoShop print screen function works intermittently. The only way to “fix” the problem is to reboot, which is not convenient while working. Most of my online searches for fixes to this problem directed me to CS3 fixes, but I found a blog that explains the CS2 fix as well.

This is really easy.

1. Open Notepad and type:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Adobe\Photoshop\10.0]
“AlwaysImportClipboard”=dword:00000001

(Version 10.0 in the string above is Photoshop CS3. If you have CS2, use 9.0; for CS, 8.0; and for Photoshop 7, 7.0.)

2. Save the file as AlwaysImportClipbd_ON.reg (I saved it on my desktop so it is always handy.

3. Double-click on it. That’s it!

Thanks for this info at: 

 http://microsoft.blognewschannel.com/archives/2007/09/05/how-to-fix-the-photoshop-clipboard/