ok, it seems like i have 2 repeating problems.
1. When i cancel render process, 3ds max crashes without any error messages. It happens only on a big heavy scenes, but not always. I was unable to determine how and why it happens, but it happens often (well, i think every 5-6th time when i hit stop render button).
2. DR don't want to work correctly, on slave machine DR repeating starts and stop, starts and stop without any effect for the whole render process.
All this errors happens with the latest Oct 3 2014 build, Daily build post-A7, 3ds max 2014 sp5.