I have fixed a bug in the application page whereby if you have a mandatory field, it runs the form submit through jobman_apply_filter and it is looking in the wrong DOM element to make sure it has content in it.
/js/display.js is the file
line #5 is the line.
field = jQuery("[name=jobman-field-" + jobman_mandatory_ids[ii] + "]");
field = jQuery("[name=jobman-field-display-" + jobman_mandatory_ids[ii] + "]");