I only get a blank page (with the background of the theme) when I open a game (like Hangman or Millionaire). I have tested it under Google Chrome and IE 10 and on different computers. The activity works when I change the theme to something else. It also works on the built-in bootsrapbase theme 'Clean'.

When I turn on debugging mode, this is what I get:

Notice: Undefined variable: DB in /var/www/virtual/digilecke.com/htdocs/mod/game/header.php on line 15 Fatal error: Call to a member function get_record() on a non-object in /var/www/virtual/digilecke.com/htdocs/mod/game/header.php on line 15

I hope it is solvable!