All of my Apps stopped working!!!!! worked fine until after I synched

I had the same problem. I had downloaded the Apps via my iPhone. I tried removing and re-adding them via syncing, but that didn't work. It told me that it couldn't install because I wasn't authorized to use the applications on this computer. So I completely deleted the apps, downloaded them from the iTunes app store on my computer, reinstalled, and they work just fine.

I had the same problem -- everything working fine and dandy until I synced. Afterwards, apps would quit as soon as I launched them, and the only way to get them working again was to delete them all and redownload/install them. Plugging my iPhone back into my Mac gave me an error saying the computer was not authorized.

Even if you paid for applications, you can redownload them for free. Just delete them and re-install them from the App Store, and they'll be reinstalled without additional charges.

That solution seems to work for any app I downloaded through my computer, but any app I downloaded via the iPhone (over 3G network) will not delete. These 3 apps (iPint, Remote, iMaza) continue to open, then immediately close.

Any solution for these apps?

I have the same problem here. All downloaded apps quit immediately after launching. I've only downloaded from the App Store on the iPhone and synced with my PC once. I have no clue what happened, they just stopped working. The only thing I've done different since they worked last was plug it into a car charger.

Same problem here, dl'd apps from phone, then when I synced iTunes said I wasn't authorized, sounds like it is happening to alot of people.

Mine started doing the same thing, but not after a sync. All my apps(4) were downloaded via the iphone. They all just stopped working last night. They try to launch, and the first screen background may display, but then it goes back to the homescreen. BTW, rebooting the iphone doesn't help.

Obligitory "Me Too" post...

This needs an answer pretty quick. I too got the same issue so after I reinstalled the apps to get them back I avoid iTunes until they get this resolved.

what has worked for me is to restart the phone after you've loaded apps onto it. making sure your iTunes is "authorized" on that computer helps too. but after i loaded new apps, or currents apps had been updated (like NYT), it requred a restart of the phone (hold power and home until you see the apple logo, ignore the "slide to turn off")

There are only two absolute fixes I have found for this:
#1 - Never sync you phone with iTunes ever again and the apps will work fine...
#2 - If you do sync, delete all your apps and re-install them...

RIDICULOUS.

This was posted in another thread, it was my problem and could be many others as well. My computer was not authorized in iTunes.

link here - http://support.apple.com/kb/TS1389?viewlocale=en_US

that's a different problem... i only use one iTunes and it's authorized.

There is another thread already started on this subject:

http://discussions.apple.com/thread.jspa?threadID=1602784&tstart=75

The workaround is to delete the apps from the iPhone and reload them (to the iPhone) from iTunes via a resync.

This worked for me... thanks!