Have you tried logging out, closing the app (as in, going in to the multitasking and closing it), then logging back in? If you haven't, try that. IF that doesn't work, well, just try that.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry