''AIR file is damaged'' error on Update...

I've searched the forum and come close to an answer (seems there is a problem with Vista on networked drives), but this does not address my issue.

When I use ApplicationUpdaterUI, I get the update message and I run into problems with Download Now, either Install Now or Install Later:

• Install Now: It downloads the installation, but then says ''Sorry...AIR file is damaged''.?However, this same AIR file has no problem if I launched it after downloading it manually.
• Postpone Until Restart: When the app restarts, it goes into ''Waiting for the application to exit'' and just sits there.?If I manually exit the application, then it goes through the update with no problem.?I thought it was at first because my ''closing'' attribute goes and asks the user for verification (via Alert), but when I removed that, it still has a problem closing the app.?Is there a hook in which I can see if this forced exit is being called?

Thanks for any insights into this!

-jonathan