WYSE 5060 won't port video through KVM

Good Morning, 

Completed a search but did not find a solution. We have 70+ 5060's and operate in an enviornment where we need to use a KVM with display ports. The 5060 will not push video through the KVM, but will directly plugged into the same monitor.  We have tried a Belkin secure 104 KVM and a Vertive KVM, both with a display port.  We also have a Vertive KVM with DVI and that pushed the video through.  I've tried playing with the resolution settings and resetting the KVM but so far cannot get it to work. from a laptop or PC the KVM pushed video fine. Anyone have any suggestions to try?

Thanks for the help and your time. 

CD