You are correct, and didn't do that thinking there was nothing to learn from it. But, I should have said what it was to remove all doubt.
Now, thinking about it, there is something to learn from my experience. Try another machine!
In this case, I had worked all day trying to figure out why my movie render out of Motion 5 contained audio artifacts. Upcut audio. Out of sync. Etc. All day! Nothing would work. The original text of this message was to ask for ideas. Just as I clicked to POST the message I got the idea of saving my project along with it's media to make it easy to put on a portable hard drive and move it to my new 17" MBP (Thunderbolt) laptop. On the laptop the movie export (using Compressor) came out with clean audio.
I also realized that the computing environment has played a big role in my problems of late; on the desktop I use most, no clean audio export but good on the laptop from the same project. On the laptop, neither Motion 5 or FCPX will export directly to Movie without crashing, but they do that without crashing on the desktop but Motion 5 will not give me clean, in-sync audio.