Address for all but UK customers not saving

[RobbieBlokeToys]

Hello,

I updated to a new theme and ever since I've been experiencing a terrible problem where customers outside the UK cannot progress through the order process.

Personal Information is completed and progresses.

Addresses only works for UK customers, when any other country is selected from the drop and the customer clicks "Continue" the page refreshes to a log in.

I'm completely baffled.

There has to be an issue with the theme but I have no idea what I need to do about this.

Anyone have any advice?

[RobbieBlokeToys]

Update,

Through lots of trial and error I have narrowed down the problem to the default country setting under International > Localization > Configuration.

If I change the default country from UK to USA, now only addresses for the USA can be created and all others redirect to a log-in without saving.

If I change it back to my own country UK, the problem returns for all other countries.

I have no idea why this is happening.

 

[RobbieBlokeToys]

Update 2

When I disable guest checkout anyone can order from any country, but the page throws a 500 error and has to be refreshed.

Once refreshed the address is there but the customer then has to click to go back home or change address etc, there is no continue button to go to payment.

[RobbieBlokeToys]

I believe I've established that it has to be the theme.

I found information on a very similar problem and that person swapped out 2 theme files for core theme files.

I attempted that and it seemed to fix the problem but only once. The problem quickly returned again for the second attempt.

This suggests to me that more theme files would need to be changed.

Things I've tried:

1. Deactivated modules relating to customer accounts/orders (other than the primary cart module)

2. Removed/replaced shipping options to rule them out.

3. Removed/replaced countries to rule them out.

4. Ensured no tax settings are impacting account creation.

The only thing it can be is the theme.

If anyone can recommend which theme files I should attempt to swap out for the original theme files, and what might need to be changed, I would appreciate it. I would like to attempt that before I remove the theme entirely and return to the original theme.

For those who it might help the theme is "Food Store", which now seems to be unsupported and abandoned. So, I would recommend not using it.

If I can't get this fixed in the next couple hours I'm going to spend the day rebuilding the site with the original theme. And in the future, I will only be investing in paid themes with active support.

[Prestashop Addict]

Please specify PS version and theme used