When I log in I get a "Not Secure" warning in the corner of my browser. Might want to look into your site's SSL certificates or something since it only recently started doing that. It used to be green and say "secure". In the last two weeks give or take it seems to have stopped being "secure".
I'm constantly getting logged out while using the site. I have to clear my cookies/cache to stay in for a few hours. I think it has something to do with what they mentioned ^^ a few of my friends are too.
I'm not noticing any of the abovementioned SSL issues, but then I also (purposefully) use outdated versions of Firefox on both my phone and laptop. Might be an issue that's only showing up in more-modern browser versions.
As for userpics, it took longer than usual to upload last night but the icons themselves have been displaying properly and uploaded properly. This is a big improvement from the performance I saw with a different account about a week ago, where some icons were uploaded twice, others never uploaded, and many of them became broken images upon upload. So it does seem to be doing much better at present.