I have the same problem as well. Before windows 10 one of my presenters had this problem, i am not sure whether she still has this problem because she is no longer presenting . After my switch from w7 to w10 i have the same problem, also some of my attendents experience this problem. In my own situation this problem ocurred after my upgrade to W10. I normally use a separate camera connected via usb. After this one freezes i switch to my built in camera, that freezes as well after a while. When i switch back or switch my camera off and on again, there is a video outline but it is gray/black. And from then on it is no longer possible to send out my video. The rest of the screen remains ok, audio too. I keep on hosting the meeting, but my attendents prefer to see me. It looks like somewhere a buffer is overflowing. Since this problem also occurred earlier i am not completely sure it is connected to W10 but it looks like W10 did not solve it either.
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