If you have a door way in addition to the door frame you are importing, then both could be stopping you from going through the door. I would test if you can walk through the doorway without the door frame in the way. This will help to narrow down which hole is not letting you pass-thru. Double-click the imported doorframe and from the editor that pops up go to the Collision section on the right hand side (scroll down). Under COLLISION COMPLEXITY, change it to UseComplexAsSimple instead of PROJECT DEFAULT. Not trying to repeat what ZacD said, but I was having trouble finding UseComplexAsSimple, just adding onto where to find it. Thanx for the info ZacD