When Photoshop imports the clipboard from external applications, it needs to ask the Windows Clipboard for data contained there. But sometimes this function doesn't update the data from the clipboard - and an application-restart or even an OS-restart is required before it works again. The symptoms are:  

• Photoshop won't paste clipboard from other external applications
• Print Screen does not work.

Solution 1: Use the Alt+Print Screen combo instead, capturing the active window. This might work for a few.

Solution 2: Download the file AlwaysImportClipbd_ON.reg file. This is included in the Photoshop CS install disk. This will force Photoshop to ALWAYS ask the clipboard. Sweet!

Path: Photoshop CS3/Goodies/Optional Plug-Ins/Photoshop Only/Optional Extensions

Register-file for Photoshop CS3: 

Here are the CS3 Windows-file if you don't bother finding or making it(edit in Notepad to check the code):

AlwaysImportClipbd_ON.reg - Downloads:

Code in file:

Windows Registry Editor Version 5.00 [HKEY_CURRENT_USERSoftwareAdobePhotoshop10.0] “AlwaysImportClipboard”=dword:00000001

Register-file for all Photoshop CS-versions:

Here are all files for CS3, CS2 and CS - Windows:

AlwaysImport_allversions.zip - Downloads:

Code in files:

 Windows Registry Editor Version 5.00
[HKEY_CURRENT_USERSoftwareAdobePhotoshop10.0]
“AlwaysImportClipboard”=dword:00000001

 Windows Registry Editor Version 5.00
[HKEY_CURRENT_USERSoftwareAdobePhotoshop9.0]
“AlwaysImportClipboard”=dword:00000001

 Windows Registry Editor Version 5.00
[HKEY_CURRENT_USERSoftwareAdobePhotoshop8.0]
“AlwaysImportClipboard”=dword:00000001

Tags: Error, clipboard, print screen, Print Scrn, Photoshop, CS, CS2, CS3, register, Master Collection, Adobe, Windows XP, Vista, Windows 64.