Esther I put in a value of 6 for mine.  I didn't notice a difference in quality.  I don't think there is much of one, it just refers to how many digits the morph value has I believe as in 5.0000 or 5.000000
He does cover that in the read me but honestly I just skimmed that part.

Sweet,
I got that error as well.  One thing to do is to check your pose file and see if the file was created anyway.  I never did get a "Done" message.  Probably my screwy comp.  I think sometimes there are different little ins and outs for everyone.
Make sure you are inputing the "answer" in all 3 of the areas it asks for.  Double check the read me to make sure you are doing it right.  Im sorry I can't be more helpful but those are the steps I took to correct my error.

Hope these answers help a little

I am:  aka Velocity3d