Gamma shift with C300 MKII footage FCPX 10.3.1

Since the latest update, I am getting a gamma shift. When I play the footage it's a stop darker and when I'm paused it jumps up raising the blacks...

I have FCPX 10.3.1 on a Mac PRO 6 core running El Capitan 10.11.6

The footage is C-log 3 from the C300 MK II and when I import it in it transcodes it to prores.

I have also loaded in the MXF files as they are to test but it still shifts gamma.

I have also tried rec 2020 in wide gamut but the same problem is there.

When I load up the footage in VLC player or Canon XF utility it displays the gamma how it was before I updated the camera firmware and the latest FCPX/OS updates.

Here is a clip to show you the issue.

vimeopro.com/acenlab/cane





Any help would be great!

Thx