Reproduce: Create a single-line textbox custom field with the following settings and with a maximum length of '32': Try to register and type a larger number of characters into our test field (by increasing the maxLength of the form via firebug). The form has vanished in the next error page. Desired Functionality: The form should always be present and editable inside Registration, even if it set to be editable once. - If you go a page back in the history, the form is still editable. This bug also exists when using custom callbacks to verify field values.