ProjeQtOr Version 9.3.1
Safari Version 15.0
If you call the previous page "<" in the browser by mistake, the program ends up in nirvana.
The display: "You are already connected on this browser, possibly on another tab. Use specific button 'Open new tab' without messing session."
does not really help.
You have to delete the cookies and restart ProjeQtOr.
Message should block navigation to previous browser page (wich is connection page as Projeqtor is a one-page web application)
Unfortunately, the function is not blocked and the system hangs. Only the already mentioned steps before a new login really help.