"WDBtnMgrUI.exe not responding" when logging off

This happens all the time: whenever I log off or shut down (Windows XP Pro w/ multiple users), I get a window that WDBtnMgrUI.exe is not responding, and I have to click on the button to quit it, or the window will stay up and prevent the log-off or shut-down.  Very annoying to always have to do that, or come back later to realize it’s still hung up.

Any recommendations?