I have been having similar issues. No problem with previous FCPX until 10.0.3. I shoot DVCProHD (which Apple claims to support+ at 29.97, 720pn. Suddenly with 10.0.3 update I am unable to import P2 media from HPX170. Final Cut reads them fine from the camera, but will not import. I tried changing card readers, computers – no difference. The new version of FCPX does not like the HPX170. Furthermore, Apple has removed it from the compatibility list! Will Apple remove the roadblock or will Panasonic deliver a firmware update for the 170?