In all MS Office applications whenever I open the "customize" dialog, clicking anywhere on the dialog produces a "ding" and nothing else. Note that I can navigate the dialog fine using the keyboard, but the mouse is entirely disabled.
After a series of restarts, removing applications from starting etc. I narrowed down the offender to WB. I'm running WB (WB about box = 4.3, SDC reports WB v4.51.047) on Windows 2000 SP4, with Office 2003.