This is unlikely (p<0.05) to help in this case, but sometimes client-side validation is stricter than server-side. I recently had to disable the max-length on a text entry box so that I could enter the reference number I'd been given (but I checked and there isn't a max-length on the old password box here); another time I had to disable javascript so that I could use an email address with a + that had been accepted before.