[SOLVED] "#" is added at the end of the URL after login

All of a sudden the "#" character is added at the end of the URL after a login attempt.
Where does that come from ?


We start the application with a login page : http://10.43.1.172:8080/Inventory/login.php?return=true&

After we try to login (which we cannot) the page stays there and the URL is changed to : http://10.43.1.172:8080/Inventory/login.php?return=true

So a # character is added to the URL and nothing happens.

What is causing this trouble ?

Many thanks in advance.
Danny