I took about 100 pictures last night at a local 1/3 mile race track. I was in my Action shooting/Custom bank, and when I uploaded the pictures to my PC this morning, I discovered that the 1st 54 pictures were labelled ACT 00011-0054, but after I switched to my P&S setting, the numbering switched to P&S 2980-3002. I later switched back to ACT but the numbering picked up at 3003-3044. What's up here? Nevermind, somehow I had turned on File Number Sequence.