Hustle widget does not subscribe email, just throws error

Hi Guys,

Having rather a large problem with Hustle. In that it just isn't doing the most important job of subscribing people. It just throw and error every time: Something went wrong, please try again.

When I look at firebugs console and try to subscribe an admin-ajax.php is flagged up. But it doesn't tell me much...well not that I understand anyway.

Any help?

Ta muchly.