Stop the presses. I found a fix. On the Tour, and probably any other global Blackberry that uses a sim card. Turn off your phone. Remove the back cover and take out the battery. Looking at the device, below the battery slot on the bottom left is a small sim card that is black and red with white writing and a Verizon logo on it. The sim card can be released by sliding it towards the top of the device. Use your fingernail to get it started. Take the sim card out and keep it stored some place for future use. You do not need it unless you plan to travel overseas any time soon. Replace the battery and restart your Tour. That should fix your problem with App World; it did for me. I am hoping RIM fixes this problem soon.