Owl2064

Here is the thing, I and a friend co-play SL. After he loged this SL account in his Mac Viewer and played about 1-2 weeks, I can't log this account in my Mac Viewer anymore, but the website is still OK, even I changed password on website. And I tried ways like reinstalling Viewer in my Mac, changing password to a new one, but things is still like above. And when I try to login, my friend isn't doing anything to SL with this account. I really need to resolve this problem as soon as possible, if someone could help me with this issue, that would be very kind.