On my main account I went to character select, was unable to load character select, so closed client, then unable to reach patch server for 10 minutes. Just now (6:40AM PST) reached patch server, but unable to login now on any other account.
Currently logged in vending accounts' clients operating normally, have not changed character on them yet.
I'll check back in a bit, hope it gets resolved before maintenance (need to use monster tokens ).