thanks again but there is a check box for DOF in the render room in Carrara8 Pro.  With it checked and with the camera DOF enabled, I do not always get the DOF effect in the final render, full retraced or not.

At best, I get a 50/50 chance of the DOF rendering, thus, I just do not try to use it and if it is nessasary, I do it in postwork like I did HERE

I was just wondering if anyone else had seen this problem.  It is very posible it is just my machine or my program.

Thanks, Gib