So I updated the firmware on my ESXi hosts this weekend. Here is the behaviour I am now seeing.
Connecting via zero client to 2x22 inch monitors, works in dual monitor mode VDGA, resolution on Windows desktop is 1680x1050 (ie: the native resolution of the monitors). However, if I connect via the same zero client (Wyse P25 with latest firmware, for the record) to 2 x 24 inch monitors (1920x1200 native resolution) then it connects, but the desktop only flashes briefly on the 2nd screen, then goes black. The desktop loads fine on the 1st screen and uses the Nvidia GRID card at 1920x1200 resolution.
Any thoughts?