04-02-2013 12:14 PM
Knowing nothing more than what your post states (which requires some significant assumptions), 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 the icon remains hidden, please check that you have "Show All" active and that you dig into every homescreen folder and subfolder. Also be sure you don't have a custom theme running that may be hiding it. Also review these KBs:
Also review this extensive thread: