I’ve had a problem with a few projects from FCP X. The AAFs produced (via a 3rd party app, not sure which) sometimes have material at 44.1 (music generally). Nuendo doesn’t automatically convert it, so it plays fast. I can convert the clips in the pool, but then I have to manually reproduce any edits.
I tried opening one of these AAFs on Pro tools and it was fine - PT converted everything. I was then able to export this as a new trouble-free AAF, so I have a get-around. But I’d rather not have to go through the PT phase.