Don't worry, I believe you that there is a bug. I'm just having trouble duplicating it, and trying to make sure the map position just isn't moving.
So when you do live tracking do you use the "Center map on position" feature?
If so (and I'd think you do), then the icon is always in the center of the screen, if the GPS is reporting a position 5000 miles from the last known position, right?
I definitely got both GPS units I tested with to lose all signal. Not hard to do with older Garmin units when indoors. What I have not done is test it while actually moving, in a car. I suppose that is the next avenue to explore since I can't get it to do anything while stationary.
One question about when you need to reinstall. This really sounds like you're getting your map position moved to Africa or something. When you're outside the US you will get no maps in topo or aerial. Did you note the coordinates being reported when you move the mouse around? Are you sure you were still in the US? If you switch to Landsat, you should see where in the world you are, and it's easy to zoom out and pan back. Or, double click on a file to auto zoom/pan the map to show that file back in the US.
Sorry for all the questions, I just still suspect that the position is moving somewhere bogus. I'll quit with it if you can answer those above, and will change my thinking.