When carrying out a couple of specific (but seemingly unrelated) administrative tasks (see below for details), Magento (18.104.22.168) appears to log out the administrative user, presenting them with the login page.
I say "appears to" because pressing the browser's back button reveals that the user is still logged in (they can navigate to other pages and carry out other administrative tasks).
However, if they try to log in from the login page above, their login always fails.
This initially suggested to me that there was something wrong with the secure key. But disabling secure keys makes no difference.
Are there any circumstances under which Magento would be expected to behave as above?
The two scenarios both involve the use of from different third parties:
- With Mageworx's "Advanced Product Options" (4.12.0), the problem occurs when users attempt to navigate to Catalog -> Advanced Product Options
- With Bleulliette's "Enhanced Admin Grids (+ Editor)" (0.8.9), the problem occurs when users try to add a category or attribute column to Manage Products
It seems unlikely that they would have the same "bug", so it look like an issue with a common element - such as Magento core, or our site configuration.