When you get the Wrong Number Of Vertices error it's usually due to a welding error. Make absolutely sure that you do not click the "weld identical vertices" in Poser at any point of the operation. It will change the number of verts and then the morph won't import. Of course you shouldn't alter the obj in any way (except for pulling vertices to make the morph) in Max either. No smoothing, no welding and of course no subdivision of any kind.

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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.