Hi People!!
I'd like to mention, what quick fix i use for this situation. Since, I know there are lot many people who encounter this problem. It's a simple fix. Save your render setting using "render presets". Start a new instance of max. Merge all the geometry from the corrupted file to this one... and load the saved "render preset".
I'm still searching for a permanent solution... So, good if someone knows how to fix it....
thanx