Creating an If/Else statement using WPAlchemy MetaBox radio boxs

not sure what you are doing wrong, your code looks ok at first glance … make sure you represent yes and no as string values …

if ( 'yes' == $provenance_mb->get_the_value( 'docposs' ) ) {
    echo "If you wish to make";
} else if ( 'no' == $provenance_mb->get_the_value( 'docposs' ) ) {
    echo "an apple pie from scratch,";
} else {
    echo "you must first invent the universe";
}