Apps won't sync from iTouch to computer.  iTunes recognizes the iTouch and the app content, but the content is grayed out on the computer screen and won't allow me to sync.  My iTouch is version 4.2.1 with 6.8GB  capacity.

I am on vacation and away from my home computer.  I installed iTunes on a computer I'm using at my son's house to enable
me to sync my iTouch, since it has become unstable when I am playing games and continually closes and reverts to the home
screen.
My son's computer recognizes my iTouch and my apps appear on the screen but they are all grayed out and will not allow me
to sync.  Can anyone help me please?

Your iPod can only be synced with one iTunes library at a time. If you try to add content to it from another computer it will erase the contents of your iPod and replacement it with the contents of the new library.
In regards to the unstableness, have you tried a hard reset to see if that makes a difference?  To do this, press and hold both the Sleep/Wake and Home buttons together long enough for the Apple logo to appear.
B-rock

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