Use Talk Designer instead. It's installed in your version of Poser and the visemes are easy to make. Do a fast Google search for V4, M4; or whatever fig you want visemes for; and you'll find lots of free ones. There is also a fourm thread on RDNA where making them is explained and there are Gen 4 and other visemes users have made in the same thread. You'll be up and running in no time.

pdg

I just noticed you said you are on PoserPro. I have no idea which PoserPro you mean. If it is the one based on P7 I don't know if you have Talk Designer as I did not have that particular version.