Mark Tinder wrote:

… but the only program that is common to both, and not on the other 18, is Carbonite. I would not think Carbonite would cause a Security Center issue. I tried disabling Carbonite, did a reboot, same issue with Security Center - likely confirmation that Carbonite is not my culprite.

Mark, this might make sense for Win7 devices, but less so for XP devices.

The updates to Security Center in Vista/7 added the ability to monitor backup solutions, I believe. If so, Carbonite might be writing info into SecurityCenter2 somehow?

C:\> wmic /namespace:\\root\SecurityCenter PATH AntiVirusProduct get * >> %USERPROFILE%\Desktop\avlog.log
C:\> wmic /namespace:\\root\SecurityCenter2 PATH AntiVirusProduct get * >> %USERPROFILE%\Desktop\avlog.log

Run these commands on the devices that aren’t returning/displaying AV info. The commands produce a log on the Desktop. Is the AV info there?