ESX 4.1 - Guest = Server 2008 r2 - Choppy Mouse

Greets!

I have ESX 4.1, with several guest Windows Server 2008 r2.   VMware Tools = v8.3.12 build-493255, which is the latest, I suppose.

From the CONSOLE, the mouse is draggy and choppy, as if there was no VMware tools

I do not have this problem using RDP.

I do not have this problem with my Windows Server 2003 / XP machines.

(Two HOST servers, same symptoms on both.)

Ideas greatly appreciated!

Thanks!