I've been experiencing this issue way before WMP 9 was released, so it is safe to assume the player is not the culprit here. The issue first appeared when a new version of the Limewire software was released - to the best of my recollection, it was the version immediately after 2.5 which introduced the bug.

I contacted Limewire Pro support months ago, and I was essentially told the uninstall and re-install the software. When the issue was not solved, I e-mailed support again. They never had the courtesy of a reply. Draw your own conclusion.