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I could not see them only in the games. On the main event lobby, they were visible.

I couldn't see them until people started to disperse.

Which device? I noticed that the Oculus Quest needs a bit of initial time once entering a room to cache things and then it goes fine after that.

I'm just on 2D on Windows.

Haven't experienced any problems on the 2D version yet. But tomorrow if that happens again, will have it ready just to try it out.