Hello,
I downloaded the DarkBasic Pro demo, and tried loading in a jeep model that I made and exported using 3d studio max 4. Some problems occur when I load it into the Dark Basic Pro Demo, but it loads fine in my Dark Basic original.
Dark Basic:
http://www.boomspeed.com/pizza/jeep1.PNG
Dark Basic Pro:
http://www.boomspeed.com/pizza/jeep2.PNG
If this is already fixed for the retail version with the patch, then ignore this post. If any of the Dark Basic crew want the 3ds file that is shown here, i'll be more than glad to help in anyway possible.