Help! I can't checkout!

I am trying to set up shipping to Europe as I currently only ship to the UK.
Shipping to the UK is free on everything.
I have the freeoptions module set up, not the freeshipper.
This was all working fine.

I added Europe as a new zone definition and added the countries I wanted to ship to.
I then changed the freeoptions shipping module to point to my new Europe zone and tried to checkout with a European address.
This didn't work, and I got the message 'We do not currently ship to your region at this time'.
I changed the module back to point to the UK as it did originally and now I can;t even check out with a UK address. All I get is the 'We do not currently ship to your region at this time' message.

I'm guessing there must be a bug somewhere and some data has been corrupted because I literally changed that shipping module to point to Europe then back to the UK.

Can anyone help as to where to look to fix this as I can no longer take any sales online.
Any tables I can have a look at to see if there is a missing join?

Please help!

I've done some investigation and in file templates/tpl_checkout_shipping_default.php there is a call to funtion zen_count_shipping_modules() around line 57 as follows:

if (zen_count_shipping_modules() > 0) {

This function is returning 0 even though I have the freeoptions module installed.

I have fixed the problem by removing and re-installing the module.
Looks like there's a bug in there somewhere though?

If it was a bug ... then just doing a REMOVE, INSTALL and re-configuring would not fix it ...

However, if there was a configuration issue or missing configuration_keys ... doing the REMOVE, INSTALL and re-configuring would fix it ...