SDP Assests and Windows Vista

I've read several posts that indicate no issues with SDP and Vista.

However, I have (3) new machines on my network that the Windows Domain Scan does not even pick up. The machines are powered on and are participating in the network and AD. All other assest scans pick up the other 185 machines on my network.

The Vista machines do not show up at all - no errors, no listing, no nothing, nothing in the system error log.

Is SDP officially Vista compatible??

I also tried manually adding the Vista workstation as an asset and then initiating a scan now. When I do it this way, it returns an error that the workstation might be powered off. However, I'm sitting next to the workstation and it is powered on and fully participating in the network. The firewall is on, I need to leave it on, my group policy auto configures remote assistance and I successfully scan XP machines with this same config.

Are there published steps for dealing with Vista??

Thanks