Q: cannot open MXF XAVC files in quicktime or FCP7

I am working with a new Sony FS7 video camera  that records in XAVC codec as mxf  files - Same as the F5 or F55. I have installed the new ProApps update that is supposed to  make it easy to use XAVC in Final Cut 7 which I still use and have also updated  Quicktime 7 . However neither Quicktime 7 nor Final Cut 7 will open the mxf files.  I have spent time on  the FS7 discussion boards and no one can figure out why. Others are also having the same problem though.

I am on  a Macbook Pro 9,1 intel Core i7, 2.7Gz  with an Nvidia GT650 graphics card and plenty of Ram  and power and am running OS 10.9.5

I tried the same thing on my wife's computer which is around the same age as mine and the files opened up immediately in QT 7 and FCP 7. I assume there is some kind of conflict going on but have no idea what it is. Because I do a lot of editing over the years a lot of things have been installed in my computer that are not in my wife's thus my suspicion of a conflict.