I asked if it sometimes does work because there can be more than one problem.

I think I'd be able to help more if people would post more pictures and describe what was done differently in each one.

For example, if you were to show me a render of a problem area, closeup and nice and big so I can see it well, using only a single infinite lights with shadows off, shadows on, raytrace shadows, depthmapped shadows, high shadow map size, low shadow map size, then again with IBL with AO, without AO, and so on.

Actually if you did all that, you'd probably find out what the problem is without me.

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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)