Has anybody experienced this (screenshot attached). It happens on both FF and IE, both connecting directly to ESXi host and V-Center. It happened on 6.0 and now on 6.7 and also it happens on both VMRC and WebConsole. I access my VM and do some work and everything is good and then my screen freezes. I refresh my browser and all I get is the attached screenshot. I can SSH in and everything is still running. I can't figure out if VMWare tools is stuck or the Gnome display freezes. Only way to restore is reboot.
My ESX host is running on Cisco UCS C240M. I have four VMs running. Issue only hits one of the VMs at a time. CPU/Processes/Memory are all being used minimally... nothing is spiking when it happens.