We are running KDE on CentOS 5.10 and virtual desktops are enabled by default. But we still face this problem in which the screen contents seem to be sampled every Nth of a second as a bitmap and sent over the network to the client (viewer). At least that is my interpretation of titan’s post. We have not solved this problem yet and have moved on to other things. It seems we need a paid subscription to send data to Nomachine tech support so we haven’t followed up. If you are able to find the time to resolve this via some configuration change on your server, please post the solution. I may delegate this problem to one of our resident Linux experts soon.