We're not entirely sure what's going on here, but we've just had a flood of e-mails from users who are reporting that our app is crashing when they try to use it. Coincidently they all appear to be AT&T variants of Windows Phone. We're currently testing the app to establish exactly what's happened but first tests seem to show that when loading over the AT&T mobile network, the app fails, Wi-Fi connections and other networks appear to be unaffected.
If the app is crashing it's because you're signed into the forums which seem to be blocked in the way we're accessing them. A re-install of the app should fix that but you may then struggle to see articles loading.
We'll be testing some beta versions of the app over the next couple of days and see if there's anything we can do to fix this, hold tight in the meantime and we'll be sure to update when we have a solid fix for you, and we'll be trying to contact someone at AT&T for assistance if at all possible.