Installed DJ On Air Widget 3.4.1 on WP 3.4.1 WAMP, non MU-WP install.
I can see the new button to 'add shift' but pressing the button does nothing.
I've stopped and restarted services to no avail.
Logged out and back in results = same.
Added a new user, results = same.
no pop-up blockers enabled.
same results in different browser. FF and IE & Chrome
the rest of the site is running fine.