If one tries to store an array with an element that contains commas, the elements get splitted.

E.g.
array ( 10=> "a,b" )
becomes
array ( 10=> "a", 1=>"b" )

The problem is in adm_config_set.php:
$t_values = explode( ',', trim( $t_match[1] ) );

This splits the array and ignores string boundaries.

Possible solution: split at ",\n"
Better solution: create a real parser ^^