I would say you would want to try a couple things…
1. Use the “render entire work area” command and render your timeline starting at the end and working your way back in small increments (maybe 2 minutes or less as defined by moving you work area bracket), and saving after each successful completion.
This may reveal the point in the timeline that is giving you thr problem, and when if the render fails in an area, you can now start to look at a more and more targeted point in time by making smaller and smaller work areas to render.
This will at least get you to a point of knowing if there is a timeline/media. problem, and where it is…
2. If you are able to get the entire timeline rendered through this process, chances are that selecting “use previews” in the export setup may get you back in business at least.
There do seem to be some effects (Magic Bullet Looks comes to mind for me) that Media Encoder doesn’t implement properly and doing a “pre- render” to create a preview file is the way to handle it at this point…
TimK,
Director, Consultant
Kolb Productions,