After "Session Timeout" on IE11, a duplicate login pop up window displays. Users can still login using the top window.
Steps to Reproduce
1. Modify the system property glide.ui.session_timeout with a shorter time out value if needed for testing purposes.
2. Simply leave the browser window open until "Session Timeout" the login pop up window appears.
3. Wait a few minutes more, and another duplicate login pop window appears.
This problem has been fixed. There is no workaround available. If you are able to upgrade, review the Fixed In section to determine the latest version with a permanent fix your instance can be upgraded to.
Related Problem: PRB1331616