"Certificate error occurred for the update server." msg when doing a VMWare Tools Download or Check for updates

I've performed a clean install of VMWare Fusion 5.0.2 on a new machine running OS X 10.8.2. Every time I attempt to create a new VM (I've tried Ubuntu 12.04 & 12.10) and the tools download process starts I get the error "Certificate error occurred for the update server."

I've also noticed that doing a simple "Check for updates..." produces the same error msg.

Is anyone else seeing this? Any ideas on how to resolve?

Thanks