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Yeah, they are probably using the javascript change event to trigger the enabling of that submit button. Unfortunately, most autocomplete functions don't trigger the change event.

It's a real pain; you end up having to poll the form fields for changes and then trigger the change event manually.

I always add autocomplete="off" to my inputs, cuts down on this type of thing.

That would just annoy me more, I use autocomplete wherever and whenever -- any site that doesn't let me autocomplete something that should be autocomplete-able always gets on my nerves.

Disabling an useful feature in order to make coding slightly easier seems a bit backwards.

Had the same issue and thought the form was just broken until I saw your comment. This is probably losing them a lot of signups.

This should be working much better now, thanks for all the feedback on this. If you're interested we just open sourced the MooTools class that handles the validation - https://github.com/BankSimple/ValidateSimple