I've had nothing but trouble with Poser and ATI cards (except that I just got a nice, slightly used-and-therefore-very-cheap laptop .. with an ATI card. I'd sworn never to get close to one of those again, but to my surprise, Poser has so far behaved nicely with it.

I've occasionally had somewhat the problem you have, and that's with my nVidia card - I've found that making sure the bounding box starts INSIDE the object helps. It's inconvenient but at least that way I can select SOMETHING...

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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.