If I enable Save Simulation to PRT it only seems to be writing 0.1 amount of particles. I double checked the PRT Loader to see if it was defaulted to the VP display value of of 1% but that didn’t make sense, since it was writing 10%. Did I do something wrong?
max2013_STK_FRST_PlaneEmit02.max (256 KB)
Cannot repro.
I saved the Stoke particles to disk, created a new PRT Loader by clicking on the + button (that has 100% viewport anyway), and the numbers matched perfectly on every frame - both Stoke and PRT Loader had the exactly same number of particles. Of course PRT Surface has a higher count, but that’s just for seeding and it does not get saved.
Yeah weird (or good really 
) I just tried it at home and it works as expected.