I attempted to sign up for MTGO today, but the damn software won't seem to allow it. I bought the account and several cards, but when I attempted to log in (using the name and password sent in my email) the program will not let me enter. It says "Bad username or password."
Odds are it has something to do with that password. Remember that MTGO passwords are case-sensitive and must include both capital and lowercase letters, so a password like "thisisapassword" wouldn't be allowed, but one like "ThisIsAPassword" would be allowed.
How long did you wait before trying to log on. I have helped a couple people and there is about a 1-2 lag before your account is actually active. Try again later.
What could possibly have caused this travesty?
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I've seen the password come with an extra character at the end (a linux line feed, if I'm correct). That can cause that issue.