Thanks to all for your responses. Not sure whether you prefer individual responses or not. I'm just responding to everyone's post in this one reply.
1) I did toggle on Numlock several times to see it was the issue. It didn't work when I was having the problem.
2) I did use the toolbar and right-click, but they're cumbersome.
3) Yes, I have a function key, and I tried pressing it several times to see if it was stuck in some crazy state.
4) Clicking on the view didn't help either.
I will continue to monitor. It could be a keyboard driver and Video driver conflict of some sort - brings back memories of driver/dll hell from the older versions of Windows.
If it happens again, is there any kind of data I could gather? Run a debug version of AM or something?
BTW, before I had this issue, I was having another issue with groups, the groups I was creating were getting screwed up so I went to NVIDIA and downloaded their latest driver for the Video card and that fixed the issue. My groups were all in good shape. So I'm thinking this may be a conflict with the NVIDIA video driver and the System keyboard driver and happens only when a series of unrelated steps are done. Usually a tough situation to troubleshoot remotely let alone physically on the system. So I really appreciate your help in answering.
BTW, I have OpenGL 4.2.0. It looks like the latest version out there. Is there something I can do to verify that I do have the latest OpenGL drivers?
Thanks again for your help.
Best Regards,