"Login Failed" for existing characters

Hi,

since today I cannot login to my characters.
Login to the account and character selection screen works fine and reliably.
New characters can also be logged into.
Existing Characters, all of which I still logged into yesterday, will not go past the loading screen, get stuck there for a little, and either display "login failed" or "disconnected from server".

I deleted Interface, WTF and Cache folders. No success.
This is valid on two different computers and two different connections.

Does anybody face the same issue?
Can it be related to server maintenance / update yesterday?

This is the log:

2/5 22:57:28.723 GRUNT: state: LOGIN_STATE_CONNECTING result: LOGIN_OK
2/5 22:57:28.768 GRUNT: state: RESPONSE_CONNECTED result: LOGIN_OK 51.178.64.97:3724
2/5 22:57:28.826 GRUNT: state: LOGIN_STATE_AUTHENTICATING result: LOGIN_OK
2/5 22:57:29.183 GRUNT: state: LOGIN_STATE_CHECKINGVERSIONS result: LOGIN_OK
2/5 22:57:29.239 GRUNT: state: LOGIN_STATE_HANDSHAKING result: LOGIN_OK
2/5 22:57:29.469 GRUNT: state: LOGIN_STATE_AUTHENTICATED result: LOGIN_OK
2/5 22:57:29.493 ClientConnection Initiating: COP_CONNECT code=CSTATUS_CONNECTING
2/5 22:57:29.730 ClientConnection Completed: COP_CONNECT code=REALM_LIST_REALM_NOT_FOUND result=FALSE
2/5 22:57:29.774 ClientConnection Initiating: COP_CONNECT code=CSTATUS_CONNECTING
2/5 22:57:31.027 ClientConnection Completed: COP_CONNECT code=RESPONSE_CONNECTED result=TRUE
2/5 22:57:31.027 ClientConnection Initiating: COP_AUTHENTICATE code=CSTATUS_AUTHENTICATING
2/5 22:57:31.780 ClientConnection Completed: COP_AUTHENTICATE code=AUTH_OK result=TRUE
2/5 22:57:31.780 ClientConnection Initiating: COP_GET_CHARACTERS code=43
2/5 22:57:35.092 ClientConnection Completed: COP_GET_CHARACTERS code=44 result=TRUE
2/5 22:57:38.180 GRUNT: state: LOGIN_STATE_DISCONNECTED result: LOGIN_OK
2/5 22:57:41.557 ClientConnection Initiating: COP_LOGIN_CHARACTER code=76