Hmm then it must be exclusively related to Skydrive uploading. Though when I had ATT locker set to auto upload it never did that. Does you ATT auto upload actually work ?
I have a 920 with GDR3. I had the same issue with GDR2. If I use the default camera, I can activate it without putting in my pin by holding the camera button down. The nokia camera app prompts for a pin if I set it as default camera. It's probably not a huge issue for some people, but I frequently use my 920 for pictures, so it's annoying as hell for me
Not sure, but that function works on the Lumia 1020. When on lock screen, I hold the camera button and pro cam launches did you chec your settings? Maybe you need GDR2?