Copy/Paste Oddity Word 2000

Our problem deals with Copy/Paste in Word 2000. We have a few users who are using IBM T40 laptops who are experiencing problems when the copy and paste in Word 2000. They are currently using a Y-like connector to connect their external mouse and keyboards to their laptops. They also are using external monitors. After highlighting text within a document, they click on Edit/Copy from the menu bar then Edit/Paste again from the menu bar. What appears in their document is a graphic much like you would get when you click the Print Screen button. If the clipboard toolbar is displayed, sometimes they will see a graphic instead of the usual W. The clipboard graphic contains a W, a cylinder and pyramid. This does not happen everytime however, it seems to be happening more than 50% of the time.

Has anyone seen or heard of this before? If so, what might be a solution. We've already given them completely new laptops, keyboards, mouse and connector.