A posting this past week by Randy Seaver at Genea-Musings points up challenges with a GEDCOM export from Family Tree Maker 2011 to RootsMagic. See Dear Randy: How should I transfer my FTM 2011 database to RootsMagic?
Of particular interest are Randy's comments "I've had private emails wondering if Ancestry.com has sabotaged the FTM 2011 GEDCOM files for business reasons - so that users have to use FTM rather than buy a new program. I don't believe that, since the problems have existed for years (at least since FTM Version 16, and probably from FTM Version 5) and nothing has been done about it."
Randy provides specific examples of the GEDCOM issues he discovered.
Sad, but true, and well-documented.