Quote - and i do not see a option for exporting poser as collada.

P7 doesn't have one, stick with OBJ. Can't help much without details on the PZ3 import problem, other than to suggest you try with something simple (say just a primitive) and then add other stuff (or strip your original scene right down, and go from there) until you hit a problem.
That way you'll at least know what the problem item is.