I know it is really annoying, all those format wars and all the different interpretations by the different software packages. Really frustrating. We're trying to stick to the format standards for the assets ( dae / obj ), but it seems others do not care so much about that (e.g. inverting values). Thus, importing stuff into CE and going back to the target app sometimes is a pita. Actually not sometimes, every time.
We've been working on the collada importer recently, so that should not be an issue.
Matt