Wrong redirect when the User is already logged in

I have created a Project with User Security Level.
After Login, i want to redirect the User to a special Grid.
For that, i have changed “app_login” Event “onValidateSuccess” from “sc_redir(‘app_menu’);” to “sc_redir(‘grid_adressen’);”.
Normaly, it works as it should. But if the user is already logged in and want to login for example from another Browser Window, a Popup appears and tell, that the user is already logged in. If i press on “Ok” there, the redirect does not work, it redirects me to “app_menu”.
What is the Problem there?

Has anyone found the solution to this issue?

Use a different browser if you need more than one session on the same pc. The user session is kept on application level (single cookie). Therefore you cannot use different account within the same browser.