I have been trying to complete a render for about a week now and it will get about 3/4 of the way through the render and then quit with an error message about a memory allocation error.  The scene is not terribly complex and it is using settings and shaders I have used in the past.  I tried a variety of things, tweaking the render setting slightly, changing the size of the render blocks, etc., but nothing is working.

Any suggestions?  I am using C7.2 Pro.