I am also having the endless loading screen problem but it has now got the point where I cannot play the game. The character select screen loads, I choose my character and then wait forever until the error message appears, close my client and try again.
I couldn’t log onto GW today it has become that bad. This never used to happen before and the recent patches have only seemed to make it worse. I think the problem mostly happens in Lion’s Arch, but then of course I can’t log on to get out of there.
And it crashes and leaves me there when (or if, amazingly) I ever manage to log on.
As I said, after 45 minutes of trying I have given up for tonight. These endless loading screens are infuriating.