Just filled out IMM5406 form, but cannot validate, checked the dates, formats and everything is correct, reinstalled the Adobe reader to the latest version, also tried it on different PC and Laptop, still cannot validate, no error message, nothing shows when clicking the validate button, and today is the deadline to submit the application form, would IRCC extend the dates by any chance if I call to tell them the issue??? anyone experienced the same problem not being able to validate the form?