I realize that you said you weren't getting any error messages; however, this may help you troubleshoot your problem some:
http://support.microsoft.com/default...;en-us;Q315854 with as buggy as Window ME is, it is a good site to bookmark. You might find your answers there.
BTW: have you tried using any of the other gnutella clients to see if you have a similar problem.
There is a problem with Matrox video cards and windows millenium .... what sort of video card do you have?
Have you d/l'd the latest software updates to windows from the microsoft site?
just a few q's to help.