Or; I rather have the feeling it is maybe to that new ingame IM page? Perhaps it has trouble loading it or something? Because on my other accounts I do sometimes get a script error of being unable to read a webpage inside of Rohan, but the error message does not shut the game down
However; with that account; I do not even get the chance of starting the game (the error message I mentioned pops up right before the start is finished)
So. Maybe all new accounts made in that time after the ingame IM patch suffer some sort of programming issue? x_x