[dArKmIsChIeF]

alright, after the autoupdate, the game will run a program called BNupdate.exe...now normally if u dblclicked it without dling an autoupdate, it will say that "this is a program used by Battle.net and does not need to be run", but if you downloaded the autoupdate and it doesn't automatically update, just run BNupdate.exe, i assure you it will work. although, the reason why it keeps going back to the multiplayer screen is probably one of these:

-altered server data (most likely due to hacks, private servers)
-update problems (as said above)
-Battle.net server problems (unlikely, but possible)
-router ports/firewalls (most likely not, as explained in previous posts)
-and MOST likely (because it happened to me at a sleepover with GoVi) IP BANS, this happens all the time and i have absoultely NO idea how to fix it, i could use help too ...

if u think its one of the above problems, just say so and ill try to help out...