Failed to save frame buffer

I’m rendering out an animation with Brazil/Bongo an noticing a funny glitch, I don’t know if it’s a “bug” in Rhino or just a Windows thing. The scene is relatively simple, so about 3/4 of the time spent on each frame is on the single-threaded setup stuff(one of the nice things about Neon is avoiding that…) so to try to wring more out of dual Xeons I have so far 4 Rhino sessions rendering out at once. Now that I have so many open, once in a while one will pause to tell me it failed to write the image buffer to the .rimage file in a temp folder.