I downloaded and installed on phpbb 3.0 Gold
In the beginning, I noticed that if I set the theme to K_Kitty through the user preference panel, I was not able to change it to something else even if other themes were available. It kept reverting back to your K-Kitty no matter how many times I tried to use another theme.
Fortunately, I had an open window for the administration control panel, so I force changed the skin by default to something else.... and everything was ok.
Later, unfortunately, I made a misake and changed the default skin to K_Kitty and left the control panel.
Now I have the problem that I can no longer enter the Administration Control Panel through the link at the bottom of the page. Each time I try to go into the admin control panel, I get the message "To administer the board you must re-authenticate yourself." When I enter my user name and password, it loops to the same "To administer the board you must re-authenticate yourself." screen.