I had a client that just reported that when going to our SmarterMail server via her browser this message always appears "Another user is already logged in on this browser with 'Remember Me' enabled", even though no other account is ever used on that computer. I checked and saw that was an issue two versions ago that had supposedly been corrected.
I tried to duplicate the issue and the same thing happened to me when I tested. (SM v16.3.6496).
Additionally, after being logged in, I was not able to log out. I just get a blank white page with the black menu bar at the top. Interesting that when you try to click on any of the links in that menu bar, a red "ERROR_HAS_OCCURRED" error shows in the bottom right corner.
What might be going on here?