UPBGE 0.3 screen is black

When I start my UPBGE 0.3 game, the camera (screen) is black. But the game itself and the sounds work. Only the camera does not work. What can I do?
P.S in the viewport game renderer, only about have of the time the camera turns black, when I ress “P”. In the fullscreen player or if the scene loads in the game, it has always this bug.

Sounds related to this thread (Which also didn’t get solved). Maybe @lordloki_reloaded or @aWeirdOwl can shed some light on this issue.

Yes, we have an open issue with this problem yet (https://github.com/UPBGE/upbge/issues/1323).

A mitigation is to check the use viewport render.