If I try to login, I get
I’ve cleared my cookies and am allowing third party cookies.
I’m using chrome but have also tried on opera but I have the same issue there, but I only get
Is anyone else having trouble? 
Same issue here, emailed Support three weeks ago and no word yet. Can’t do anything on my end.
Appears to be Answers logging me in and out at the same time and getting confused about it.
Ah ok, I wanted to check I wasn’t the only one having problems before emailing them (just done), will let you know if I hear anything. Have you found a workaround?
Nope. Haven’t been able to ask or answer on Answers since this started. I can clear all my unity3d cookies and view stuff, but that’s no fun. 
Having the same problem on Firefox, Chrome, and Chrome in Incognito mode. Sad face.
Just heard back from support, no good news >.<
What kind of answer is that? If it’s happening on every browser we try, how ISN’T it their fault? Stupid.
This statement is wrong. It`s a known problem with the User account. At least they know now. Contact support again, they will fix it for you. May need a while though, they are at fixing this at a one by one basis.
Tiles is correct but I will get the web team to look at your account and get back to you.
@Befall Please watch your language.
Just checking, should I be contacting support again?
No it’s fine, I’ve got you listed we are getting round to everyone as quick as we can but the web team also have other responsibilities so that’s what is clogging it up.
Well, I’ve bee desperate to get onto answers for over a month. I’ve tried over a dozen different browsers too, including the obscure stuff.
I understand your busy, but when pro purchasers such as myself can’t access your community pages, you can imagine how frustrating it can be.
I understand your frustration, we are still working on a overall fix for this while getting individual accounts working. I’ll take a note of your account and forward it to the web team.
Same issue here 
can you add me to the list please Aurore 
yup
Same issue here …
I’m having this issue. I can however log in if I accept third party cookies. I just don’t want to accept 3rd party cookies for all sites, and adding “[*.]unity3d.com” doesn’t do it. Any idea what domains would have to be accepted for this to work?
(EDIT: not actually sure it’s exactly the same issue, but an issue with login in (it redirects and logs me out almost immediately after getting logged in)
Im also having this issue. @ Please add me to that list as well. Thank you.
Edit: If this is an actual problem still, of course. Or should I contact the support?
Are you also getting redirected to http://answers.unity3d.com/users/local_logout.html ? Or getting stuck in too many redirects?
I’ll have a look at your account, do you get any errors in the JavaScript console when you try to log in that you could send me screenshots of?