Hi, as an update, last night I ran:

Code:
sudo apt-get update
sudo apt-get upgrade
and the system successfully upgraded. Now, when I open Update Manager, it tells me that all the updates are current. In addition, I've been able to successfully install software from the Software Center.

One obvious question is, why did we have to do this to get our iso installs to work properly? It looks as if the rev on the iso server hasn't caught up with the updates.

I'm on Launchpad, and will file a bug report. This needs to get fixed.