Draft mode actually seems to be nothing more than a collection of standard render settings that favour speed over quality. It doesn't necessarily imply sloppiness, just lower quality or less features, such as ray tracing. Given this, you may want to try fiddling with some of the individual settings, "remove back facing polygons" seems to be an obvious candidate that may give you some insight into where the problem is coming from. Ray traced shadows may also be a candidate. Bill