Update to version 4.3.x

Everything seems to be working on a fresh install and in our production sites.
What’s is not working with the plugin in your experiences?

We can not recreate the problem at this moment so it’s difficult to understand why it’s not working for you.

Could you try adding the mask to the list yourself by adding the following piece of code to your functions.php?

function wpkenneth_gform_iban_add_mask($masks){
    $masks['IBAN'] = 'iban';
    return $masks;
}
add_filter( 'gform_input_masks', 'wpkenneth_gform_iban_add_mask' );

Good to hear.
So basically the plugin does work but for some reason it doesn’t execute the filter to add the actual working mask to the dropdown list. It sounds like there is something in the way of our plugin but if you don’t mind addind the mask to the dropdown yourself with that code snippet than everything is good for now.