Has anyone managed to get the recaptcha working on the create account page with FEC installed?

I've just taken over a zencart site and I'm "feeling" my way around!

I had a problem with recaptcha on the contact page but I've fixed that :)

But on the create account page (weirdly called /log-in on the frontend) I can get the Recaptcha box to show up but either ticking the box or not just refreshes the page with no errors? (nothing in the log files or server logs)

After digging I see that the FEC mod has it's own template & module files for creating accounts etc...

So I have /includes/modules/fec_create_account.php as well as the normal zencart create_account.php file

Template wise I have includes/templates/<my-template>/templates/tpl_login_default.php which seems to control the layout of the login / register page and has FEC code in it?

Zencart Version: 1.5.4