Quoted from robin:Okay, so far the reports confirm that this is an iOS/Safari related bug. Still working on this, sorry for the inconvenience.
It's also been happening with Win 7 / Firefox on laptop and desktop PC too. Usually works okay on the second try. Often when doing thumb up or down and preview post also, not just final posting. Just happened when I previewed this post, but again only first time, then okay next try.