Guild Bank Bug
Make sure you are on the server in which the Guild was established. Also, you can try changing cities, as this seems to alleviate the problem, sometimes.
well… I tried it in Eternal battle grounds, with this mega server stuff, I’ve had it working without any issues, but it just now it decides not to work. I hope Arenanet does something about this
Well, as it is an individual issue, you might consider contact CS for assistance.
Good luck.