You are welcome to post your SQL database out here or PM me with it to look at. Answering this without actually being able to look at your structures is like trying to fly a 747 blind....I might get lucky and hit the runway but it would sure be a lot easier if I could just see it 
The bottom line is that an exception is probably being thrown OR you are not running the most recent version of the DDT as there were recently some changes made to the import wizard to respect schema names which caused some issues similar to this.
It looks as though you are a trial user so another option would be to download the 1.6.7 beta which I know should have this issue resolved and that way I know that we are on the same page. You can get that beta here: http://forum.strataframe.net/FindPost20191.aspx .
It is a supported beta and stable as well. I would recommend loading this first before sending your structures over.