Open Port in Evo problem

Hi there.

New Crystal Light owner.

Trying to get RaceRoom Sim to play nice and being an old DX9 native steam game it was recommenend to change to Evo and use SBOYS3 driver. Problem i have is that every time I turn on open port my screen turns off in the headset. Turn open port off and it’s back on again. Anyone else had this and can offer any help?

Thanks

Open port just when turning Steam VR. Close port with closing Steam VR - otherwise black screen.

Thanks.It turns Steam VR off when started, which fooled me. Turn back on and OK.

Thanks again