Update.. All is well. Simon suggested a couple of things..
One that I'm not sure I would have ever thought of. Turn off any 'compatibility' settings for FSX. Mine was set for 'Windows 7'. When I unchecked it, panning was back to normal..
I've tried it both with stock 'clear skies' and AS16. However, according to the thread that you pointed me to, my settings in AS16 might have been too aggressive.