That happened to me too when I tried to sign up. I tried all my different email address and none of them worked. I was getting frustrated and about to say forget it. Finally I tried signing up with "LDM G8" as my username instead of "LDM" and it worked. It says the username cannot be shorter than 3 characters, but maybe the spam filter throws up a flag as well if it's a short name. I'm guessing you tried signing up as "polo" there like you are here. If Shawn isn't able to help you get signed up, maybe try something like "polo G8".