Everyone who has out of date video drivers experiences this. Some people experience this even with updated drivers, but this is very rare. I have also seen at least two people who denied it was a video driver problem because they were sure they had the most up to date driver, but they were wrong. Somebody else would tell them that there was a newer driver, once they reported which one they had.

So my advice is try very hard to find and install a newer video driver. If you're absolutely sure you have that already, then report the problem to SM, along with your video driver version and your video card model.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)