It might have to do with M3 itself - I seem to remember the original version had some problems.
You could redownload M3 and upgrade it to SR1, that fixed the problems I read about.

You can also try exporting Posette as .OBJ. If that works fine, it's probably M3 at fault. If that also doesn't work, then it's Poser itself, you'll probably have to reinstall.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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