can't type the letter s or c in obj inspector

I have a few saved desktop configs.
In two of them, the obj inspect, todo list, project manager, watch list and
codeguard info windows are all docked on the right into a nice neat little
tabbed tool window.

I noticed that I cannot type the letters s or c into any fields in the obj
inspector under this arrangement. If I undock the obj inspector, I can type
those letters again.
Weird - anyone else notice this? If so, I'll post a bug report...if not,
I'll guess it's some fluke.
Martin