[Nikki Francis]

Thanks, yes, will try this. My project is a documentary, with all sorts of stills, so there might be something for compressor to object to.

I would (in a perfect world) like to take it straight off of FCP timeline as the quality is better.

[Nikki Francis]

Yes, all seems well on smaller projects of the same codec and different codecs. I think it may be due to the size.
It only crashes at the end of the project and the compressed file is totally missing but the compressed audio file is fine.
Where does the file go? It’s got be be on my computer somewhere, right?

I will make a self contained quicktime movie and run that through compressor, I’m sure that will work but there is a quality difference.
I’m also puzzled about the file being totally missing.