Yes, I did try Quicktime (6.5.2)

It doesn't even recognize the file. Saying it is "a file Quicktime doesn't understand". This leads me to believe the file itself is problematic. Though I find it odd that nobody else has said anything about this (a file that loads fine, verifies, and yet doesn't play). Well there were a few other threads, but no concrete answers as far as I could see.

So far I haven't been able to find the exact troublesome files. But when I do I'll try to download them again. Too bad some of these files are over 300 MB.

A long experiment.

Do you suggest other mp3 players that have helped in other problems?
Thanks for your response, I appreciate it.