Adding input mask on a field causing my form to disappear.

I decided to add an input mask on a field and after saving the form, I refreshed the form and it disappeared. Removing the mask restores the form. I have tried adding the mask on another field, including an existing and a brand new field.

Rob,

I activated a different theme and the form worked with input mask. Certainly has something to do with my theme. Am I on my own figuring out what in my theme is causing the issue?

Any help would be greatly appreciated but understandable if not.