Date popup fields and CCK field validation

I'm trying to use editable fields to edit a list of schedule entries. These nodes have a date field that when I click on the update cause the following error message:

warning: mysql_real_escape_string() expects parameter 1 to be string, array given in /opt/lampp/htdocs/cpd/includes/database.mysql.inc on line 405.

Upon investigation it because the function date_popup_process() is not be called when the form is being submitted. This converts the dates from arrays to a ISO datetime string. Additionally, date_combo_validate() is not being called - which leads me to assume that the CCK series of hooks - process, validate, submit is not being called when update is being pressed - is this true? And is it fixable?

Thanks for any help!

Alex