No audio on H264 outputs created from mpeg original

Hi

This has happened twice now, and I'm not sure what cleared it before

I've created a clip using 'Match Sequence settings' and created an mpeg file which has audio.  If I automatically (using the my watchfolder option) or manually, by dragging into AME create a wmv or H264 version, they have no audio!

Any ideas?

I'm using CC on a windows PC with a FX3800 NVidea card.  CUDA as renderer

I think if I export stright to the H264 from PPro, that works fine

Thanks in advance