Anyone that does run into this problem, in the launcher settings, change the "Engine" to "MBII Client".
I felt dumb that I didn't do that before but the launcher doesn't preset that, so once I did that, I was able to get in without an issue from the launcher.
So I've tried to find a recent post about this, just in case it was something to do with the new update.. If this was answered, I'm sorry for asking again.
HOWEVER...
Whenever I try to click "join" the game closes. No error message, music stops and it closes. It's happened every time so far...
I've tried reinstalling, restarting, resetting modem, etc.. But no servers show up at all for me. I refresh the list, still nothing. Am I missing something or was there an update to MB in the last 2 months?