I know what the problem is, just can't get anyone to fix it.
Basically for some reason only in Mozilla based browsers (Firefox, opera, Nutscrape) something you do in the site as a member basically records your IP address and for some reasons bans you based on your IP.
If you are ojn a laptop you can test this like I did by taking the laptop somewhere else and loading up RMM in Firefox and you will see it will magically work if you use a new IP at a friends house or whatever.
Took me 2 years to figure it out, and I still can't get anyone to fix it... but I will eventually if it's the last thing I do!
I only had sporadic problems with it until about a month ago when it stopped working altogether.