I had over 30 apps to update. After redeeming a gift certificate, the updates all instantly vanished, and itunes said I have 0 updates, accessed from 4g. In fact, I checked, and the apps are NOT updated. I tried rebooting, and I tried logging in and out of the store. Did not help. What else can I try? I dont sync very often at all, I suppose I could do that. (Shudders)
It says mine are all up to date too, though I should have over 120 available to update. Probably something to do with the App Store on device, which is acting kind of wonky.
I noticed the same thing today also. All my apps are suddenly up to date. Just a temporary glitch I guess...