Showing threads is broken on the site, too. You can't go to a notification and then view the whole thread on the website itself either. Just a pretty crappy issue with the update that came out a couple weeks back.
As for refreshing though, as long as you do get the thread/forum on your screen at all, to refresh all you have to do is pull down and if you pull far enough it'll refresh.
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That's what I did in the video. The thread turns blank.