When you run Imprudence viewer first time, before to connect, you have to correctly setup grid's parameters. Don't take care about what you see on the middle of the screen, it depend of the viewer version and from the pre-setted grid (usually "Second Life"), in the bottom of the screen push on button "Grid Manager". On Windows system you can press CTRL+P to get same result.
The following popup window will come out in the middle of the screen and...
...follow next six steps:
The "Preference" window will close and you will be back to main window contents.
Click on grid selector and select endiveworld in the list, fillup "First name", "Last name" and "Password" fields, then click "Log In" button.
WELCOME ABOARD :)