Leaving for the night but you got to get that FumeFX Sim done. Check this handy script buried in the help file.
$.selectedcache = 0 –Select default cache
$.runsimulation 0 –Sim default cache
$.selectedcache = 0 –Select default cache again just in case
$.runsimulation 2 –Sim wavelet cache
$.selectedcache = 1 –Select wavelet cache
Also if your running RPManager you can add this to the end to get it to render after it Sims.
macros.run “RPManager” RPManager”
number stands for the pass you want to render ie(123)