I recently migrated to CentOS 5.2 Gnome.  I found that I often encounter loss of keyboard control.  Maple reacts well to my mouse, but to nothing from my keyboard.

I don't know how to reproduce the phenomenon, but it often happens when I switch back from another desktop workspace.

I found that when I open a new document and back, the keyboard control will return.  What's the problem?  Anyone else encountered the same problem?  How can I solve?

Thanks!