No. I use file menu quit, just like any other program.

I've even waited for the WHOLE THING to finish before quiting once. Didn't help.

Am I to understand that no one else has this problem? That's odd...
I don't think I've done anything unusual, except my "shared folder" is used by iTunes as well

Here is the structure...
[Root]
[Music]
[...lots of folders by artist...] [limewire] [incomplete]

The folder [music] is the folder itunes organizes all of my mp3s in, as well as the shared folder for limewire. Does that make sense?