Shortcode not display value

I have a Meta Box plugin installed with the extension bundle.

I've set up a meta box with text ID values for "recording_length" and "recording_date".

I'd like to have the value of recording_length display. So...

I tried the shortcode (bracket)rwmb_meta meta_key="recording_length" type="text"(bracket) and nothing appears.

However, nothing appears on the post/page view.

Pretty sure I'm missing something simple.

Any help would be appreciated--Thanks!