"I had this happen with Poses I made in P7, even though I changed the version no, I still got version error messages in P5 & P6. I ended up saving them again in P5, & then they worked fine."

Don't know if they were expressions or what, but I've found a few (very few) Poser files that had the version number twice, once at the top of the file and once near the bottom. If you had one of those and changed the top one thinking it was the only one then that might explain it.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken