4 bounces should be enough from what I know. The setting even says "1 or 2 for reflections"

I vaguely remember something about this from long ago. the Reflection of a reflection thing. I'm not 100% sure Poser can do it right. Same with reflection of displacement maps that at least at some point was wrong. Something about it being calculated at render time and if the mirror is the first thing rendered (as it would be with a reflecting floor), the renderer doesn't yet know that the floor also reflects when it encounteres it in the mirror?

 

I may well be way off but I'm sure i've read something about this issue earlier. I just don't remember if or what the solution was...

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.