Exporting an hour long movie and part of the output is completely blank

I have an hour long project which is very simple with very few clips and transitions.
I have exported as Pro Res 422 (Master File) and in the export window I can skim through the clip and all seems fine. When I export a whole chunk in the middle is completly blank! No video or audio.
The parts before and after are fine. In fact the same clip appears all the way through, and the blank part is referencing the same clip as the other sections. The blank section is from 26min to 57 mins (if you can see from the screenshot)
I have checked all the media is in the Event folder and not referenced elsewhere. I have tried to delete render files etc.
I am using the latest FCPX.
Has anyone else encountered this? Very weird

Hi Russ. Original footage is ProRes 422 (recorded on an Atomos Samurai). I copied into the event when I imported and did not need to optimize.
The 1st time I exported as above, the middle section was blank.
The 2nd time I exported (after deleting render files) the first section was blank.
I am now attempting to join the 2 sections together and re-export!!!
Apart from the single video clip, I have used a number of jpegs and under each jpeg is a custom black generator to produce a black background under the images. I wonder if they are causing it or maybe there is a jpeg with some weird resolutions or something.

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