I am having the same problem, and watching how many people are playing the game (Top of screen), I think it is a server bug. It happened a while ago to me, But it got solved fairly quickly. Sometimes the maps crash, and then there is such a stampede of players who got their characters stuck.
A while back, I was climbing Ascension Island (Btw this one is alot better than IT) just for another character, then the map crashes. I went on my other character in Sky's Rim, And a few players are like "I can't log in" and blah blah. Usually people who never come to the forums have these problems. Whenever I try to log back in after crashing, I get stuck at loading screen. Pretty much a server bug.