Question

[row]
[column size="eight"]
    [row]<h5>HELLO<strong>WORLD</strong></h5>[/row]
    [row]<h5>CATEGORIES: <strong>WEB / CREATIONS / INTERACTIVE DESIGN</strong></h5>[/row]
[/column]
[column size="four"]Insert your content here[/column]
[/row]

This is the shortcode code im using. But for some reason, the [row]…[/row] shortcode doesn’t seem to work.
Heres the shortcode functon:

function su_column_shortcode( $atts, $content = null ) {
    extract( shortcode_atts( array(
            'size' => 'six'
            ), $atts ) );
    return '<div class="' . $size . ' columns">' . su_do_shortcode( $content, 'c' ) . '</div>';
}
function su_row_shortcode($atta = null, $content = null ) {
    return '<div class="row">'.su_do_shortcode( $content, 'r').'</div>';
}

Answer 1

What you describe is not a question, but a fact.

WordPress shortcodes can not be nested. If you need nesting, you would need to do “nesting” on your own, by applying all shortcodes on the “inner” part inside your shortcode your own.

See Shortcode API Limitations: Nested Shortcodes^Codex