Trouble logging on in certain zones?

[Meduin]

I seem to be having connection troubles. I reach the character selection screen just fine, but if I choose ones that are in certain zones (Lake of Ill Omen and Firiona Vie have given me the most frustration so far), it will hang as if it's progressing to the loading screen, and then I get kicked back to the account login. No errors, no other clues. Just straight to the account screen. And when I try again, i'll get the "active character" error for the first few tries before proceeding back to character selection.

Any ideas?