Yes, that seems to be the problem. However, I then went into the vJoy configuration and disabled vJoy, to get the monitors to turn off. I now wanted to get back into a game and use it again, so I went back into the configuration, enabled it again, and now it no longer works.
It is picked up by windows, but no movement detected from it. Game extension is enabled too. In windows it all works as expected, gaze trace is spot on, and it can navigate everything else too, just vJoy no longer working. Does it need to be somehow reset or what can be going on there?