Hi Ralf,
Thanks for the quick reply.
I run a Rift-S and the runtime switcher is used because SteamVR causes some games (IL-2 BOS etc) to run badly, stutter etc so is switches it over to using opencomposite instead of SteamVR.
This is not a process running in the background and should not effect Vorpx as other steam games I run in Vorpx work fine.
I have checked in the Vorpx settings and Oculus is selected as the device in General Settings.
BattleEye is disabled in the ArmA III launcher and I even uninstalled it to try that, no joy.
Any other ideas would be welcomed.
Bryan