first, sorry my English

Saving to stream failed (ref: String Save <Broken Pipe> )

This message was wroten at each node when I try to render using RenderMan.
I's big suprise for me, because several hours ago, before I installed 3DMax, render was fine!
Please help me!

My guess would be that your PATH environment variable no longer contains prman.

good news to me
I found solvation. I simply create new user and it's start work.
I really do not know what was the broblem,
what do you think? How to make it work on old user?

That still sounds like to me some sort of environment variable problem.