Well, is your RAM filled up or not? Are those 12 gb gone or do you have enough free space left while rendering?
I cleaned out the registry a few days ago... and I cleaned Max.
Maybe the best solution is to HIDE SELECTED everything that is not in the scene. I have created a model with alot going on in each room.
My master plan was to finish the model completely and then take a render of each room... since all the rooms are open plan and join onto each other.
Is there another way I can clean the RAM that I don't know about?
When I used Vray for Sketchup... since Sketchup was not 64bit and could only use 3GB of ram it used to crash on heavy scenes. Hence my move to Max.
I had to clean my regisrty out often with a little script before render. But, I should not have this problem with 12GB of Ram.