Mmkay, about modeling buildings in MED, or in particular, modeling buildings in MED after transfering them in from WED.

In wed I built a simple 'house'-type structure, hollowed it out (no doors or windows for the sake of testing) and brought it into MED.

Now, please see the below PIC. first I must apologize for the lackadaisical skin I put on the roof (and the lack of skin anywhere else) but I literally made it in 3 mins in photoshop, and the skin was way too small to begin with (got stretched out a lot).

The problem I have is that MED doesn't seem to interpret the geometry perfectly... see those faces that are inexplicably missing, painted GREY or are just completely see-thru?



Any one have a clue how to avoid this.. Maybe I didn't give enough thickness to my rooftop area? perhaps the method I used is flawed and in the future when I try to create stuff in WED for export to MED, I should be extremely careful and use simple geometry??