I am using Proxmox 1.9 on a 2 node cluster, vm's running great. Since some days when i click on "Virtual Machine Configuration/Tab Status/Open VNC Console", an empty vnc window shows up. When i click the Monitor Tab, the window also stays empty. I don't know whats wrong with my configuration. I can offer you a TeamViewer 6 session and/or skype session to hunt this bug down. Thank you in advance, please help me. Bug solved. You need a 32Bit Java-JRE on the Windows operating system running your browser even if you have a 64Bit Win 7 with multiple JDK's installed like i have.