On a topic with many replies, when I try to change the owner of a post, I encounter an annoying problem on my mobile browser (iOS10 Safari).
The dialog for looking up the new owner keeps vanishing offscreen. I see it momentarily if I tap the iOS menu bar to shortcut to the top of the page. But then as earlier posts automatically load, the dialog quickly vanishes again. Interestingly, I’m able to keep the dialog onscreen if I minimise the keyboard.