My updated iPod apps don't sync to iTunes
I update my apps constantly on my iPod Touch (4th gen) But when I sync it the apps don't seem to transfer over. After a while I have update them manually on iTunes. How can I fix this? I used to be able to update them on my iPod and then transfer them over to iTunes whenever I would sync it, but now it doesn't seem to work.
iMac (21.5-inch Late 2009), Mac OS X (10.6.8), I want the new one :(