Helped, but not fully
Egads! Ok same thing happened to me today, and I did as HexMonkey instructed. After that, starting "Mac Help" did pull up the OS X help menu. But some of the links (a level or 2 down) resulted in "TopicListNoResults". For example, I choose For Windows switchers -> Useful keyboard shortcuts -> More about shortcuts, then I end up getting that "TopicListNoResults" message.
This happened with some other menu choices, too.
Can anyone shed light on what's going on? Why does HexMonkey's fix work? At the same time, why is it not fully solving my problem??
Oh yeah - I'd ask Apple Support on the phone, but the boogers are closed right now!