02-25-2013 09:29 AM
Hi and Welcome to the Community!!
AppWorld itself? That is a little odd...but, please try this sequence:
1) Remove AppWorld from your BB
2) Do a Batt-Pull reboot (power on, remove battery, wait, insert battery, wait), even if redundant to the one you did in step 1.
3) Install (on your BB) a fresh copy of AppWorld
4) Do another Batt-Pull reboot
5) See if it now works.
If you continue to receive the 907 (at step 3), then are you perhaps on BES? If so, it's possible that your BES admins have restricted access to AppWorld.
Good luck and let us know!