Ended up re-installing Monitor, partly for gw2012sp2, partly for
another reason.

Had an issue where a few of my agents (mainly MTA's) would not be
monitored properly.

When my monitor machine launches monitor for the first time, I get a
user/pwd prompt for my MTAs, as I had to add them manually. When I
enter the correct user/pwd, the agent still shows as unmonitored until
I filter it out and add it again.

I tried pointing to my primary GW domain when installing monitor this
time, but that did not seem to help.

When I first launched it after installing, the only things monitored
were my POAs & GWIA. I had to add the MTAs to it, and I'm thinking now
I will have the same issue.

Any ideas?