Shortly after we upgraded the Archive to Rails 4.2, users began reporting they were being redirected to the login page when submitting forms (e.g. bookmarking a work, or posting a comment). Our coders were unable to find the cause of this problem and hoped it would resolve itself when we upgraded to Rails 5.1.
Unfortunately, the upgrade did not fix the issue, and further research has revealed this is a bug within Rails itself. The bug mainly -- but not only -- affects iPhone Safari users, and is most likely to happen when submitting a form after closing and re-opening your browser, or after leaving a page open for a number of days.
There's currently no official fix for this issue, but you may be able to work around it by using your browser's "Back" button and submitting the form again. We'll also be implementing a temporary workaround on our end by making session cookies last two weeks. This means it is very important to log out of your account if you are using a public computer. If you simply close the browser and leave, you will still be logged in and the next person to use the computer will be able to access your account.
Once an official fix becomes available, we will apply it as soon as possible. There's no word on when this will be, but in the meantime, we'll keep looking for workarounds.