This is an update to this issue:
Photoshop fails to paste my print screen from the clipboard. I’ve tested pasting in mspaint and it works fine. I’ve also tried creating a new document from clipboard but that won’t work either. What’s wrong and how do I fix it?
This is documented in stackoverflow, but the case has been closed and I wanted to give an update for Photoshop CS4
You can add a registry dword called “AlwaysImportClipboard” with a value of “1” at this location: [HKEY_CURRENT_USER\Software\Adobe\Photoshop\11.0]
Remember, version 10.0 is CS3, 11.0 is CS4
Or, you can download these registry files which accomplish the same thing:
For Photoshop CS3 (fix print screen cs3 . reg)
For Photoshop CS4 (fix print screen cs4 . reg)
Update: Hey, sometimes photoshop has a hiccup and it just won’t let you paste. Something with the clipboard gets screwy. Just restart photoshop when that happens. Even this registry fix won’t solve that bug.
Photoshop actually has to “import” the clipboard to its own format – you may notice it actually doing this when you cursor changes to an hour glass (or “busy” or “busy background”) when you switch to photoshop after copying an image to the clipboard from another application. Sometimes there will be a slight delay while this import is happening before you can use / paste the image.
Also Note: You may need to go to Image->mode->RGB or CMYK if it is set on “indexed color,” especially after opening something that has indexing enabled (like a .gif) before you can paste. Also, if you only have a background layer and it is set as “background” try either creating a new layer and pasting into that or holding “alt” (option on mac) and double clicking the background layer in the layers panel to convert it to a layer (or right click it and convert it to a layer)
Hopefully one of these things will help you paste your image.