I don't think I've seen this one in the recent list. In iPad landscape at least, latest app/iOS as far as I know, if I load a thread with sufficiently few+small posts unread on the page that the unread posts are smaller than the space allocated to view them (so like, 39 read, one unread post of a few sentences, a bunch of black below it) then the first pull-for-next-page fails and nothing happens no matter how far I pull. Second attempt always works fine. It seems to affect pull-to-refresh too having just tried that for giggles.
— power crystals