some mxf files will not appear in import window after 10.4.9 update

These files are coming from a Sony FX9 - this show has standardize around this model but it is not the same physical camera each time. I believe all of my MXF files thus far have from from this model camera. One other note is VLC is able to play the MXF files FCPX will not display, and further, Premier will still import them. So far I have tried standard troubleshooting such as making sure permissions on the folders are correct, resetting PRAM/NVRAM, deleting FCP preferences and creating a new library. In all cases Final Cut Pro still briefly shows me all of the clips in an XDROOT folder, but many quickly disappear, leaving only a small number of clips displayed.

! what ! - man that is bananas. I have to say I haven't had an issue until this recent update. Good grief. Ok just seeing this stuff now with this new info. I hope they fix this ASAP.