I am having an "endless buffering" issue with the Audio Player by 1PixelOut. (But it's not the issue described at 1PixelOut's Troubleshooting page, though it sounds similar.) I am having this issue with both Martin Laine's WordPress Audio Player plugin and the µAudio plugin, which I believe use the same Flash player.
I have Flash 10 (latest version) and have confirmed the issue on Firefox, Safari and Chrome on the Mac. I have tried switching themes and disabling plugins with no resolution.
Not sure where else I should post this issue, but I'm hoping it reaches someone's attention soon.
Thanks,
JM