Me and Mark both cant duplicate that issue, so its a guess in the open,
in sources/user_cpl.php find
PHP:
$TMPL['user_cp_main_menu'] .= '<div id="user_cp_main_menu">';
and replace it with
PHP:
$TMPL['user_cp_main_menu'] = '<div id="user_cp_main_menu">';
This has allready been changed for the 0.3 release