"Yep, AutoCAD (unless they've changed something very recently) does not handle UV texture coordinates on vertices very well. It's the reason our obj importer uses a custom object. Obj only has UV texture coordinates.…"
There is an application which adds OBJ export ability to AutoCAD, developed by SYCODE company. The development has been stopped at AutoCAD 2012 though. Also its price is quite high I think. Additionally, newer versions of AutoCAD…"