Is your MTU size set below 1500? Upgrades to several of my units in remote offices failed, where we use smaller MTU sizes to optmize the video experience (upgrades elsewhere were fine). When I moved the MTU back to 1500, the upgrades worked.
David,Did the settings that Rasimyigit suggested work?I have a several Profile Dual 55 systems and only one has this problem even though all the settings appear identical. The left monitor fails to come up, the right monitor works fine. It worked for...