no crisis, just curious about problems with high data rate for audio

After doing dozens of similar shows with this workflow I had a weird problem:

The audio (.mp2 file) for a 7 minute show came in as a one-second piece! Its type wa "not recognized" and the duration was one second and change. (The actual duration of the actual audio file was 7 minutes, and it played fine in Media Player.)

A smart friend recommended that I lower the audio data rate on my Digital Rapids card to 112 Kbps from the original 224 or 256, and Encore accepted the resulting file without problem.

The weird part is that I think I've done dozens of shows with this high audio data rate and they were fine.

Any insights as to what is actually happening?

Thanks!

-- Bob Cole