I am getting a similar "session expired" pop-up error, with exception of it not logging me out (after checking "Remember me" on login form).
Sometimes it is changed by a full-page error about not being authorized to perform the action:Error
Only members with sufficient permission can access this page.
A security error has occurred with authentication.
Please ensure that all cookies are enabled on your web browser, you are not using a saved or cached copy of the page, and your Firewall/Proxy settings are not hiding or masking your IP address.oth are resolved by refreshing the page.
It is slightly embarrassing to have to copy-paste your message before submitting though.
While registering, I have also noticed that login-related pages are taking a while (up to 15 seconds here) to respond. Perhaps something is currently broken on server side?