Routers wont cause flashing yellow and although we may need that info to get things working later.. for now I think we should find what caused this.
WinMX has a thriving chat community, and they are blocking your access to it. WinMX can be used and is used for freeware files, sharing your grannies christmas videos and your own photos. P2p is not illegal.
So yes you can call them and ask them what the hell they did to your WinMX.

Seriously just ask if they are blocking access based on 'programs your using'.
This is illegal btw so dont be surprised if they try to attmept a run around on you, or the other way they usually act is to read you the riot act about what a selfish bastid you are for wanting to use
your bandwith you
pay for such intense bandwidth use programs like a p2p, (lets face it, its not about the content, its about the fact that they sell high speed broad band then complain when you want to use it for more then web surfing or email) because you shouldn't be thinking of yourself but of the ISP who has over sold thier ability to deliever speeds, and now what you to suffer for it.
</end rant>
Call em they cant kill ya or eat ya... lol let us know what they say, maybe we'll be pleasantly surprised at the results.