Hello. I'm having a few problems with the trackpad on my mid-2010 13" MBP. The problem pertains to the dragging functionality. I am able to drag things when I double tab and drag, but I am unable to drag by merely clicking the trackpad and dragging. This problem only started occurring today. I've updated everything with software update (incase it was a rare problem which could be patched with software), and I've also tried resetting the PRAM. Neither of these have fixed the problem. Does anybody have any suggestions that preferably doesn't involve an Apple Store? My nearest one is an hour away, and it's a pain to get there. Cheers.