Have a simple form , good working on windows, and have some macs in company, that give error:
the form code :
window.fd=fd fd.spRendered(function() { $('.sysfields').hide(); fd.toolbar.buttons[0].style = "display: none;"; function changeTitle(){ fd.field('Title').value= fd.field('Evaluat').value.DisplayText+'/'+fd.field('Evaluator').value.DisplayText } fd.field('Evaluator').$on('change',changeTitle) fd.field('Evaluat').$on('change',changeTitle) });
the button code 
fd.field('IDWorkflow').value="Transmis"; return fd.save();