Anyone able to open CAD files dependably? Planswift advertises compatibility with CAD formats (even specifying DWGs are preferred). When I'm able to get a CAD file in (rarely) the snap function is awesome - and I want to be able to make better use of it! Sometimes I am able to load a DWG; other times I am not. Sometimes if I save the DWG as a DXF, I am then able to import it; other times no. I can't see a trend based on file size, location, or otherwise. I've spoken to tech support but haven't gotten any definitive answers or methods for importing CAD with repeated success. I recently did the 4GB patch, doesn't seem to have made any difference. Thoughts?