[whisp]

$Categories = array('Music', 'App', 'E-Books', 'Audiobooks', 'E-Learning Videos', 'Comedy', 'Comics', 'teszt');
$GroupedCategories = array_intersect(array('Music'), $Categories);
$CategoryIcons = array('music.png', 'apps.png', 'ebook.png', 'audiobook.png', 'elearning.png', 'comedy.png', 'comics.png', 'teszt.png');

try like this

$Categories = array('Music', 'App', 'E-Books', 'Audiobooks', 'E-Learning Videos', 'Comedy', 'Comics', 'teszt');
$CategoryIcons = array('music.png', 'apps.png', 'ebook.png', 'audiobook.png', 'elearning.png', 'comedy.png', 'comics.png', 'teszt.png');
$GroupedCategories = array_intersect(array('Music'), $Categories);

hope that works.not sure thou. mine works fine with that config.