Well I'm glad it's not just me. Ipad 2 with 8.3, SD, XGPS 150. Initially found me on the airfield but at the hold it disappeared. This was my first FIR crossing to an unknown airport so caused a bit of panic, but as one of the other posters said, I had printed the plog and routed it on my chart. I also had an iphone with SD and an off-duty instructor in the a/c who had done the route before. Used Navaids, charts etc and found my location without any trouble. Good to know I still can!
I found a web page (after many hours of searching) which gave a suggested fix of turning off all of the location services under settings --> privacy --> location services --> system services, then doing a soft reboot (home and lock until apple icon shows). It also worked for me in the car, but have yet to get back in the air to test it there.