| Wow, a long time ago
And I'd gather by now, someone has already told you to check the paths in your m3u file. Just the same, if someone else reads this at least maybe this will be the answer for them.
Generally, on my computer, within the m3u file itself the paths that tell xmms where the files are is not correctly entered. Unlike windows, the likelyhood of saving your files to a different directory after reinstalling an OS or changing one is high. I'd imagine that even the directory seperators / vs \ are enough to cause this behavior.
Unless your ready to edit every path with a text editor in that file, it would be easier just to create a new one.
Good luck | 
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