I can't make the last step in the checkout process

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.5.1
-- PHP version -- : 5.6.19
-- Browser(s) name and version -- : firefox 46.0

I have a very nasty problem.
In the hikashop checkout process at step 5 this where you select which kind of payment you want to use it goes wrong.
It doesn't make any differences which one I select when i click on Betlane (pay) the site goes blank.
What must I do toe get it working fine.
Yesterday everything was working properly.

Regards Margreet

Hello

I have Hikashop starters version HikaShop Starter 2.6.3 [1605031612] installed on the site and the checkout process is working properly again.
But when the stocks of the product doesn't change.
The amount stays and the same number.

I have tested it locally with Xampp and then its going allright
Any idea what the problem is?
This is the first time I downgrade from Hikashop Essential to starters.

Kind regards
Margreet

This issue is solved
Please will you close the ticket