According to ResPower’s support staff, their render farm versions 2.49a and 2.49b do not support particles.
I sent an animated particles scene (v2.49b) to be rendered on their farm on 6/15 and found that the particle systems weren’t rendering. I logged a support call that day and was informed a couple days later that a fix would be available in a day or two.
It’s now 6/28 and, according to their support guys, the developers are still “working on it.” I have not been able to get an estimated date for the fix.
Just a heads-up for anyone counting on using ResPower to render a scene using particles any time soon.