Oh, and I have noticed a peculiar glitch:  the first time that an AVI plays in Poser's movie node , it seems to omit the final frame.  In your case this means it will play frames 001-124, and thereafter loop correctly through frames 001-125.  So, you may want to set the start/stop numbers so as to begin on the second loop.

Can anybody else either confirm/deny this behavioral quirk?

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5