I have found some interesting things using this exporter and Lux.  This is most likely a Lux problem, but I'll mention it here.

I was rendering a pic, then saved the flm to continue later.  The pic at the time was very good, with just a little more time needed.  When I loaded the flm to continue, I get nothing but 'fireflies'.  It makes it unusable. 

So, I decided just to start from scratch and load the original and start from the beginning.  Now, Lux won't load all of the textures.