I am running Windows Vista Home Premium 64-bit. I am having trouble copying and pasting things. The issue is that after I copy something/Print Screen, it takes several pastes for Photoshop to finally realize the change. Basically, the first couple of times I paste, the thing that was previously copied gets pasted it. I don't know if it's making a difference but it switches the paste to the latest thing that was copied faster after I minimize and maximize back the program. It's extremely annoying especially because then I have to either undo each time/delete the layers. Plus, I do a lot of frame comparisons between different video sources and it's hard to tell whether the thing being pasted was changed or not. Any ideas would be greatly appreciated. Thanks.
Unless you want the whole screen, why not use the Snipping tool? It's great!
Anyway, regarding the clipboard problem try Edit > Purge> Clipboard before you capture what you want.