I experienced the same issue just now. I didn't have network tab open, sorry. I decided to ignore the stuck redirect and click on updates and I was told that I need to log in. So, I clicked the log-in and got a half log-in window. See image below. Under the same session (i.e. I didn't log-out and log back in) I went to the forums to see if I could log-in and I did, sort of.
Lately, on the forums, whenever I go to log-in, the page refreshes, but there is no visible sign that I logged-in. I still see the prompt to log in. I need to click a forum to get my avatar to show up. I don't know if its related or not.