I had a problem while registring in two different trackers:

A friend sent me an invitation to my email, so I clicked the link in orden to confirm it. The tracker asked me my username and password. After that, it told me that my account was active, so I could log in.

However, when I tried to log in, the tracker said that my account didn't exist. I tried to recover my password (i thought I didn't type it well), but the tracker didn't recognize my email.

I tried to register again using my invitation, but I get:

Not Found
Sorry pal

Does anyone know why is this happening?