How to Fix Stuck Mac OS X Clipboard
Dan Warne (via John Gordon):
Something has been bugging me with OS X for a while — sometimes the OS X clipboard (officially known as “pasteboard”) gets stuck and won’t accept any new ‘copied’ content. Instead, when you ‘paste’ in any app, the clipboard always pastes back the last thing you successfully copied.
I’ve been seeing this for years, but it usually works again after a few minutes. He says that killing the pboard process helps.