Currently I saw a new question at Meta and wanted to login here. I'm using Tor Browser 4.5.1 or 5.0.1-alpha and was not able to login to the site. It works without any problems at the main site. But when I change to Meta and click on log in I am redirected to the previous site without getting logged in. I tried the same with Firefox 38. It worked with or without HTTPS Everywhere installed.
Could anyone help to track down this issue and to change the page that the login process works again?