I deleted and re-installed the app to get out of this bug. That killed my Hot Questions widget (it just showed the title, with no posts). I then tried to reproduce it. The second time, I tapped a 'hot question' while the app was deleted (the widget sticks around when the app is deleted.), and got an error message, before the widget changed to look like the screenshot below. Reinstalling the app doesn't fix it, I had to restart my device to get it back.
iOS 8.2, iPhone 4s, Beta App v184.108.40.206