I too, have hit an infinite loading screen. Many of my characters are in Lions Arch for ease of bank etc, and all of them are infinitely loading. Also, a friend was completing Rata Sum, and upon trying to get into the Snaff Memorial Lab, he hit a loading screen as well.
If the screens load for long enough, we get errors saying “server connection timeout. Please wait a few minutes before reloading client”
Halp.