I am also having problems with AVC-Intra 50 footage. It was imported into FCP 7 using log and transfer. I have FCP 6.0.6. Log and transfer gives me unsupported format invalid structure error. If I just import the files, into ProRes timeline, I get a message in preview window that states “codec could not be opened.” I did download and install the AVC-Intra codec from Panasonic. Can anyone help?