xman; Could you be a bit more specific in your problem? How many boxes in your renderfarm (Vue Pro only supports 5 RenderCows straight out of the box)? Have you run the downloadable update available at the E-on site? If so, have you run the seperate RenderCow update that you will find in the Vue Pro folder? The RenderCow that shipped with the initial release of Vue Pro was very broken; in fact, it was an older build that somehow got on to the CD by mistake. Are you running -any- antivirus or firewall software? Most tend to treat Vue attempting to access the Cows as unauthorized, unrecognized activity and locks the ports being called. Is Vue Pro crashing, or the Cows? And what kind of error message are you getting, if any?