Upgraded a installation to 4.3, and update the guest agent on all VM's, now all of my Windows VM's have a exclamation point telling me to install the latest guest agent. Some parts of the guest agent still seem to work, the IP addresses are still showing in the portal, but not FQDN and for some machine the shutdown button no longer functions correctly.

I also tried to a fresh 4.3 install on a test cluster, and at first it worked great. But after a few days all of the windows vm's on that setup are showing the same behavior. Linux guests are fine on both systems. Not really sure where to start looking.