Pekka wrote in post #17316775
I have only iPad 2 to test with and it has worked great. ... One problem with iOS8 Safari I encountered a while ago that if you come to a site first time unlogged and after you log in, when clicking back link the Safari would sometimes pick that very old unlogged page from the cache, and you appear to be unlogged even if you are logged in. I redid some caching instructions in AMASS which fixed that behavior in my knowledge but that could be the reason. So, if you come back next day on iPad and you seem to be logged out, refresh the page first.
I' just shut down and rebooted my iPad to test this, and indeed that did log me out from POTN. Refreshing the page doesn't fix it. (Restart of the iPad was at 06:22 UTC 7 Dec if you want to go looking for session timestamps.)
I can confirm it isn't due to Safari crashing because I figured out what sites were crashing it, stopped going there, and didn't have any crashes in that instance of iOS. Nor is it Safari having to reload pages due to low memory as I've had plenty of that with no problems. (It's an iPad3, which has 1GB, and the only iOS device with more is the iPad Air 2, which has 2GB.)
In my Safari settings I have "Block Cookies" set to "Allow from Websites I Visit", which is the default. This means Safari will accept a cookie from a web site I visit or have visited, but not some other hidden domain. It's Apple's way of defeating ad trackers. This is where I'd be looking for a bug: perhaps there's a session login cookie for POTN and the permanent login cookie is for some other domain. Sorry, I don't have details on how exactly Apple define "another domain", e.g. subdomain.