UG's DXF and DWG translators right out of drafting suck...no two ways about it. Even the 2d exchange can give you crappy output. The tried and true method is to first export your drawing to a CGM file....import that cgm file into a new part...and then export a DXF/DWG right from modelling. It makes the file a little bigger than necessary but it's the only good way to do it. I just tried the 2d exchange again last week...just for the heck of it....sure enough it threw iso's on top of plan views in my drawing...nice. I've talked most of my customers into using CGM now. A lot of packages now support it and there are several free viewers available. I would expect to see it's use grow, especially for PDM related stuff...mostly due to the small filesizes and the fact that it's a vector file rather than a raster file so the lines don't get fuzzy when you zoom in on a drawing in a viewer.