I'm using Android App version 1.0.23 on a HTC Velocity 4G running Android 4.0.3. I've experienced the same issue on previous versions of the Android App on a HTC One running Android 4.3 (rather than 4.0.3).
Whenever I have a question open on the question tab, and I pull down to refresh that tab, the entire app is frozen for the full duration of the refresh. Nowhere else in the app freezes like this: the answers tab, the questions list, and notes all refresh without a freeze.
I don't have a screenshot, as it would just be a snapshot of the point in the refresh process at which the app froze!
This is not a breaking bug, but it's inconvenient, in cases such as deciding I'd rather hit back to leave a question rather than wait for it to refresh (not possible, since the app's frozen).