I'm not sure about the shadow, but the visibility of transparent objects
with fog turbulence is a known flaw. Fog turbulence isn't calculated as
accurately as media is... it's complicated, but the way it's calculated,
rays starting in different positions will think the fog has different
turbulence patterns. It's like an abrupt change in media density. There's no
easy way around it.

For the shadow, see if raising max_trace_level helps; it's possible the fog
somehow makes it shoot another ray somewhere...

 - Slime
[ http://www.slimeland.com/ ]

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