Logic Pro X - Various problems importing AAF files

I'm trying to mix and sound design several scenes in a film in Logic X and I'm having a bunch of frustrating problems importing an AAF file (created in Avid Media Composer). When I try to import the AAF file directly into LPX, several audio regions do appear. However, it quickly became apparent that 1) these regions were way out of synch with each other (with gaps between regions, totally screwing up the edit) and 2) a number of audio regions--entire tracks--were missing all together.

I've been working with the video editor to find the right combination of AAF export setting from Avid MC, but so far none of them result in a file that Logic X can open properly. The only workaround at this point is to import the AAF into Pro Tools 10, and then re-export that Pro Tools sessions as either a new AAF or OMF. THEN and only then does Logic cooperate.

Clearly this workaround isn't practical for an entire feature film. Any ideas why Logic X isn't importing these AAF files correctly? Clearly all the data is there in these original AAF if Pro Tools can read it all properly. Why won't Logic X play ball, too?

Any help would be appreciated.