hi. i’ve been having the same problem since upgrading to SL & FCP 7.
two possible workarounds:
1) export the xml interchange format 4 from FCP 7. that has worked but not consistently.
2) if you’ve preserved your version of FCP 6, open the exported FCP 7 xml sequence in FCP 6, then reexport the sequence to xml interchange 4, then import into PR, then save PR project and import to AE. a pain, but it does seem to work.