My previous reaction seems to be a bit premature. The problem with the login button is back for me after logging in from the community page.

Here's how things are for me (latest stable Firefox or Pale Moon):

1. I can't login for any forum page - no matter how many times I enter my credentials, the site never acknowledges that I've logged in. This means that going to the front page (like many have suggested) does not do the trick. I still have to log in from there, by entering my credentials twice nonetheless. And after that, simply refreshing any forum page I already have open, does not show me as logged in, instead I have to re-open them via the "Community" tab on the front page.

2. If I open the redeem page via a secure connection and only via a secure connection (https://www.gog.com/redeem), and from there open any of my account pages, the Account tab displays correctly. This doesn't restore functionality (for instance, I can't refresh notifications), but at least it hides the visual annoyance of having the "sign up"/ "log in" buttons stare at me.

3. If I open any of my account pages from any other page (including the redeem one via a plain connection), then I get the "sign up"/ "log in" buttons in place of my Account tab.

Thanks for sharing this info HypersomniacLive atleast now I don't have to look at the annoying "Sign Up or Log in" on every encrypted page. I was able to get rid of it by following your instructions and now visually it is consistent but as you mentioned the backend is still derped for notifications.

You're welcome.

I'm inclined to say that the backend is derped for far more than just the notifications, since my visual trick works from the redeem page via a secure connection, but not over plain http of any revamped page.
I'm actually quite astonished that GOG managed to screw things up so badly - according to a reply got from support, it will take at least a month to fix this, while [url=http://www.gog.com/forum/general/forum_account_merge_with_cd_projekt_red_forums/post116]Criis said that the webdev leader only said "sooner rather than later", so who knows how long it'll actually take.

I also appeared to have the sign up/log in problem for a few days, but it has since resolved itself for whatever reason. However, my notifications are off, saying that I still have unread messages and forum replies despite my already having read them. However, my message notification disappears when I check forum replies. However, I am clearly able to interact with my account, unlike some unfortunate users here. :/ I apologize if I'm rehashing many other users' problem, but I just wanted to contribute some input.

I have the same problem with the notifications. Even though I read them they are still there. They do dissapear after awhile as in maybe 30min to an hour or so =P As for getting new messages I sometimes get them right away or it takes a couple hours for them to pop up as new messages >_>

Latest Pale Moon here.

1.
I can login on forum pages, though I keep the login button. The new post button in a thread doesn't work, but I can mark spam posts as spam. Also threads I open are marked as read.
Going to the front page does give me the account page button.

2/3.
Never tried using the https redeem page. Will have to keep that in mind.

The "sign up/ log in" bug appears to have been fixed, and I can now log in from the forum (but have not tested secure pages yet), but there are still the following issues:

1. I still need to log in twice before the "sign up/ log in? buttons give place to the Account tab.
2. The blood system refuses to remember my currency selection (USD), and every time I log in it reverts back to the regional default (EUR).
3. I still have the problem described here, and GOG support has not answered my ticket (but I expected that).

*sigh*

I just experienced this very problem in Chrome (current version) about 10 minutes ago. I was logged in and seeing my own game shelf and it clearly showed my login name, but had "Sign up/ Log in" at the top instead of "Account". Clicking on a few pages made the problem go away but I've had tonnes of problems with the GOG login since the new login went live last year both in Firefox and Chrome, both with various extensions and addons and in cleanly created pristine browser accounts with no plugins.

In Firefox, I am completely unable to post in the forums, my post gets immediately eaten - but not by the anti-spam tool like happens on new accounts with low rep, I can switch over to Chrome and post right away no problem.

I'm frequently logged out for no apparent reason while actively using the site and just clicking on one link to another, forcing me to have to log in again and when I log in in Firefox it does not log me in on the homepage, instead I have to click on "Community", log in, then click on the link to go back to the homepage. I've reported issues before but since it hadn't been addressed I just assumed I was the only one experiencing it and it would never get addressed so I stopped mentioning it. When I have a problem with the site in Firefox I just switch to Chrome temporarily and when I have a problem in Chrome I switch to Firefox. I've gotten lucky in that each problem I encounter (daily by the way) magically only is a problem in one browser or the other and don't usually see problems that happen in both very often and when I do, they usually are fixed within a week or so (because presumably it is a more major bug that hits most people rather than just those using a specific browser).

I suspect some of the login related problems are due to mixing SSL and non-SSL pages which is kind of sad because there really isn't any good reason in 2015 to avoid using SSL for everything.

What's sad is that sometimes these bugs prevent me from being able to log in and buy games on promo, so after several attempts I just give up and end up not buying anything and hoping to see the same game(s) come on sale during the next seasonal promo etc. Eventually they get my money but I'd give more if the site worked more reliably for me.

As an additional datapoint that may or may not matter, I don't have any login problems on any other websites (social networks, game distributors, online shopping, banking, just about anything) with Firefox nor Chrome. It's annoying though... If it was any other website I might just stop visiting but since it's GOG I simply can't stop visiting because I'm addicted and need them to pump DRM free games directly into my mainline. Perhaps when the Oculus Rift comes out they can use it as a retina scanner for login or something. :)


Update: http://www.gog.com/forum/general/who_else_is_having_serious_problems_interacting_with_their_acocunt_pages/post137 is basically much of what I experience also.