Your session has expired. Please proceed to login again.

I think I got it

seems that you have to edit the session_cookie_domain setting as well.

Good luck everyone!

Persists in Chrome Version 42.0.2311.90 m for Revo 2.3.3-pl

I keep getting the Your session has expired. Please proceed to login again. despite following the advice in this thread. Chrome just doesnt like the manager. I cant recall the issue in previous chrome versions...

Particularly for non-Admin users.

"Revo by default stores sessions in the database. A badly configured "cloud" could be causing this. It might be worth a try changing the System Setting "session_handler_class" to empty (delete the modSessionHandler) - then it will use the default PHP session files."
— it worked fine for me with the similar problems in MODX 2.5. Thanks a lot!

For anyone else who comes across this... If its logout/login popup specific to an Extra you're working on, try deleting the menu item/action and adding it again.