For some reason, after a few hours of working (programming - source editing), I can no longer perform cut/copy/paste operations. For some reason, when I copy something to the clipboard, and then attempt to paste it, what gets pasted was the prior entry in the clipboard. Can/does the clipboard fill up? Is there a way to release or reclaim the resources that are causing this type of mis-behavior? All I can currently do to correct the situation is reboot the pc and then it works fine for few hours and then the same problem happens again.

Any help would be appreciated.