Experienced this same issue yesterday, with the same error message in Firebug. It sent an array including only the keys and values that are set directly in the 3rd party admin, anything coming from the CF7 form was ignored or not included in the submission, which was then dropped/blocked by SugarCRM for missing required fields. I reverted back to CF7 3.8.1 until it’s compatible.
I ran into this error too, WP 3.5.1 and from what I could tell, it was causing an invalid JSON response from the Media Gallery in debug mode by adding the error message at the top of the JSON response, causing the Add Media and Featured Image buttons to only show an empty gallery. (Not the fault of this plugin in my opinion, I don’t think an unformatted and unhandled debug message should appear in an unrelated JSON response).
Line 59 is:
add_shortcode(‘minitwitter’, mtf_create_shortcode);
it should be:
add_shortcode(‘minitwitter’, ‘mtf_create_shortcode’);
Properly formatting this line according to the Codex (enclosing mtf_create_shortcode in quotes) removes the debug message and fixed the Add Media/Featured Image issue for me as well.
