Edit virtual server - Nothing happens

I am running piranha 0.7.0-3 on RedHat7.2. The piranha-gui starts fine and
looks ok, but when I click 'edit' in the 'Virtual Servers' screen, nothing
happens but the address in the browser address field changes. The only
logging I can find is the piranha-gui-access log which says:

'"GET
/secure/virtual_main.php3?selected_host=1&status=Up&name=piranha_http&addres
s=192.168.1.221&vip_nmask=&port=80&interface=eth0%3A1&virtual_service=EDIT
HTTP/1.1" 200 3706'

It looks similarily when I press 'add' or any of the other buttons.
As a matter of fact the sam thing happens whatever button in the gui I
click.
Has anyone had the same problem? Seems like I must have missed something
fundamental in the setup...

Best Regards
Per Wicklund