It’s completely broken for me in Chrome now. I get logged in, and then an automatic reload 2 seconds later and I’m logged back out. Just cleared all of my cookies and it still happens. I can get logged in in Edge though, but I hate Edge.
Huh, I’ve been getting automatically logged in properly the last few days. I’ve seen the refresh thing, but that seems to log me in, not out.
Oddly, the Chrome browser at work doesn’t have the problem with logging me out. Although I’m still forced to login every time.
I’m on FF at home, and it’s just behaving a little oddly. It’s mostly ok, but I have to log in every time I re-open the browser (not the end of the world) and have had a couple of random logouts or page reloads.
Oddly, it works fine on my phone, but I always have login on my laptop (chrome / Mac)
I’m usually logged out between visits (using four different devices across at least three different IPs), but clicking the person-button immediately makes me logged in, no stop by the login form. Yay cookies! Better than the old way, where I had to visit the scary alien lady page, tick “keep me logged in” to not be logged out while in the same session and then “log in”.
This keeps happening to me as well, had to enable third party cookies to get it to keep.
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Interesting - I recently disabled those in my Chrome browser at home. I’ll try white listing this site tonight and see if that resolves it.
Third party cookies are a requirement, because Unity ID (used to login) is hosted on unity.com vs. the Forum, which is hosted on unity3d.com. Thanks for clearing that up.
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Okay, I white listed unity3d.com and unity.com and things are working again. It’s interesting that this had been working for several weeks with 3rd party cookies off. Ah well, progress at least.
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I have the same problem, I can’t post any replies in my threads 
Here it seems to work though.
No matter which browser or PC or even cell phone I try to use…
It’s Feb 2017 and this issue still persists for me. I don’t have this issue on other websites.
Firefox
Windows 7
(all up to date)
I login, and in like 2,3 seconds it logs me off, its so fast I cant press to enter a thread or type or anything.
Iam on Chrome right now and it works,
but on Firefox it doesnt work
and I JUST updated Firefox, incase was my older version, and I shutoff ALL my plugins (didnt uninstall them though), still the same problem
Chrome works for me… but i dont like Chrome as much as Firefox
+1, often catch “You must log in” in many actions - checking recent alerts, editing posts… Browser - Google Chrome with ZenMate VPN plug-in. Under Microsoft Edge it works fine…
100% broken in chrome 56 with privacy badger on
working on vanilla safari
this is making me crazy… I can’t post in my own threads AGAIN… no matter which browser / PC / phone / tablet I try to use.
I’d like to post something im my thread here [Submitted] Lowpoly Style Desert / WildWest Pack - Community Showcases - Unity Discussions , but all I Can get is “Please log in here” 
The forums are doing that thing where you have to log in every time, again. Just started today, or possibly yesterday.
–Eric
+1, around two days ago this started to happens… Browser - MS Edge.
It always do that thing on me, both on mobile and desktop Chrome, so the issue probably not extensions
I’m constantly amazed that something so simple and trivial can be broken so regularly and for such long periods of time.