for the difference between "Loading Character Data" and "Enter World Button does not work" please see
post#62 in this thread.
The problems with the login/AH/mail/castle seem to appear periodically atm and go away on their own, just to reappear after a while.
As annoying as it is, we can't call IT every 2h during the weekend especially when what the on-call staff did does not solve the problem permanently.
And a complete restart of Artemis on every "Loading Character Data" symptom is also not warranted.
IT will investigate the issue during the usual server maintenance again.