Active HDMI to Displayport cable freaks out KVM

Hello
My graphics card has DPx1 and HDMIx1.
I purchased an active HDMI to display port adaptor (it was $AUD100 and has USB for Power) capable of 4k (I have 2xDell U2717D 2k monitors. it is hooked up to the 1st input.

My issue is that whenever i use the HDMI->DP cable, the keybroad fritzs out (all lights on keyboard blink really fast and it seems as if the KVM reboots, only when i disconnect the cable do I get a KVM beep and everything returns to normal?

I have a windows laptop on the 3rd input and It dip,doop,dips sound as if something new hardware is added.

Are active HDMI -> DP cables not supported? – any special reset commands I should try to reset things?

Regards

NZ_Carrick

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