not a surprise because we are using a new beta of TP and they have changed the core a LOT…
when we hit Render it says “Retrieving Particles…” and never does anything. 
I’ll try with TP 3.0 sp2 also and will follow-up…
How many particles is TP generating? Do you get this same behaviour if you try to generate a single particle? You might try to render the same scene in Default Scanline with facing geometry or something to see if it is much faster.
we’re using 500 particles
I’ll try with 1 or 10 or something small… as well as Scanline and facing geo…
thanks