BINGO!
Well, sort of...
It's actually two things. I had MusicMatch running, but not playing. (Processor time was not at 100% for those of you thinking that. It was barely hitting 10% while I was working.) If you quit out of it the context help eventually wakes up. However, I discovered that it's also tied to whether or not the objects you're hovering over are enclosed in some sort of structure, like a case structure, sequence structure, loop, etc. If they are the context help window gets "stuck" and only works correctly if you quit out of MusicMatch. If the objects are just "loose" on the diagram the context help works correctly regardless of whether or not MusicMatch is running. Who'd've thunk?
Definitely something I wil
l forward to NI. Whether or not it's a problem with LabVIEW is a different question.
Much appreciate the suggestion!
-Saverio