Not sure whether my issue is due to the new version coming out:

Haven't had a working internet-connection for the last three weeks, during my holiday in rural Ireland (had a great time, can advise this to anyone!

)..

Yesterday on the ferry home, I had WIFI, so I tried to check and wash my mail for the first time in three weeks but.. MWP gave a login- error!!

Completely according to Murpheys law: Just when I needed it most..
Justnow installed the new update: same problem. My account-name apparently is not recognized, so logically resetting passwrd does not work either.

Might be a server-problem. Looks like creating a new account is my only option. Will await Nicks advise on this one..