We have Spy Sweeper (from Webroot) installed. No screen cacher, or none that I know of.
The problem only occurs on CTRL-C or CTRL-V, and I can't figure out how to search for anything that is connected with this, maybe it has to do with the clipboard...

>It could be an auto-backup feature - or a sleep issue - or a system admin query. Have you run Adaware or Spybot SnD on it?
>
>A screen cacher is program that records and files snap shots or screen "copies" so that hey can be reviewed at a later time.