A couple of us reported this on Tuesday on this thread www.mumsnet.com/Talk/site_stuff/3281642-Is-there-a-problem-with-logging-in-out, which was, admittedly originally about a different issue (although I suspect they're all linked, because it happened at the same time!) and someone else started a thread in Chat (also linked on the linked thread), where a few more people were having the same problems.
But has Tech investigated the squiffy view on an iPad/tablet yet? I'm still having the same problem three days later. Can't use MN on my iPad at all.
TVM!!!