App authorization (over and over and over)

Since updating to IOS5, every couple of days my iTunes tells me that my apps are no longer authorized for this computer.  I have tried everything I can think of to get this to stop.  I have tried:
Re-authorizing from the pop-up window from the error
Authorizing from the iTunes pull-down menu after having tried both authorizing and not authorizing from the previous error window
Restoring my iPhone, both to a previous backup and as a "new" phone
Deauthorizing this computer, rebooting and reauthorizing
Going into my iTunes account and deauthorizing ALL computers (even though this IS my only authorized computer), rebooting and reauthorizing
About the only thing that I HAVEN'T tried yet (and I'm considering it) is to delete ALL of the apps both from my iPhone and my computer and then re-downloading them all, but I don't see why that would work any better. Also, I have tried changing my sync options back and forth between a "cabled" sync and a wi-fi sync, as well as changing my backup from my computer to iCloud and back again, etc. etc. etc.
I'm out of ideas to try!
Any suggestions on how to make this stop?
Hardware stuff:
iPhone 4 with iOS5
Dell XPS, Windows 7 Ultimate
iTunes 10.5.0.142
Apple Software Update says all are up-to-date
Windows Update says all up-to-date

I'm having a similar problem whenever I purchase an app on my iOS 5 iPhone and then sync it.  
When I setup my iOS 5, I used my mobileme e-mail address and then was informed that I had to combine it or something (I just can't remember exactly).  The upshot is that I think I somehow have a different username associated with my iPhone.  I don't have any problems with apps that I had before the iOS 5 upgrade as well as no problems if I purchase the app through iTunes on the computer and then sync my iPhone.  This problem only crops up if I purchase something on my iPhone.
Help.

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