I logged in using 6 digit code to email. The login page just return to logged out state after the login and the login link in the top right corner just reloads the content after first login (no options to login again). I tried clearing cookies before login, I tried private mode. This only happens in firefox but that is the browser I use for everything.
When I manually navigated to a show details page and pressed the join trakt button in the top right then I finally found myself in a logged in state.
I also got logged out and had to rewrite this post 2 times. first time it appeared as posted but disappeared shortly afterwards. Also got a modal saying I was logged out with a button to refresh the page.