Ever since I upgraded to SW 2012 my space navigator 3-D mouse has had an issue with panning.  I just updated the driver software from 3Dconnexion, but this didn't fix the problem.  Panning up/down or left/right stops all of a sudden as if it hits and invisible wall or ceiling before it pans beyond the edges of my model.  I can always zoom out to navigate to any portion of the model, but the issue makes it particularly difficult to navigate around the model while zoomed in.  Does anyone know if this has to do with a SW setting I need to change or a 3Dconnexion setting?  Or, is this just a bug that has yet to be fixed?  Thanks!