Seems to be a bug in safecracker in EE 2.6. I see it’s been moved to the first party module area and it seems dynamic title is not picked up in the processing. At line 1441 in safecracker_lib.php it checks the POST for dynamic_title but it’s no longer located there and actually embedded in the meta post variable. I adjusted the line to check for dyanmic title at $this->_meta[‘dynamic_title’] and it seems to be working now.