Also upgrading hardware version to 9 and vmware tools to current didn't help. We are seeing same issue on multiple hosts which works fine with esx5.0 base without any console issue. You may notice this console refresh issue with 5.1 VMs when you move windows inside console. You may also notice this more with esx 5.1 VM console if you have any some network latency to the esx host.
Weird!