Ummm.... so far Carrara has been nothing but a disappointment for me. Does anyone have the same problem I am having? I am simply selecting two objects and doing a subtraction boolean operation to create an arched window in a wall, and every time I try the assembly window goes blank and the message "rendering failed" appears. What the heck? Carrara is supposed to be so powerful and can't even handle a simple boolean operation? Can some one help me out here? Just a little frustrated, headgamer