When I go to change and order's status, add a comment (SALES>ORDERS>view) or edit an order (SALES>ORDERS>edit), I am returned with the following error message
[Exception... "<no message>" nsresult: "0x805e0006 (<unknown>)" location: "JS frame :: https://MYDOMAIN.co.uk/opencart-test/ad ... 1.1.min.js :: .send :: line 4" data: no]
[Exception... "<no message>" nsresult: "0x805e0006 (<unknown>)" location: "JS frame :: https://MYDOMAIN.co.uk/opencart-test/ad ... 1.1.min.js :: .send :: line 4" data: no]
undefined
This only happens when the ADMIN is set to use SSL, which is a must.
Does anyone know why this happens / how to fix it?
I'll be honest, I am testing both Opencart and Prestashop. I'd rather go with Opencart as the admin is so much easier to use and more intuitive, where as Prestashop is massively complicated and a PIA to use, but PS doesn't throw me any technical problems like this

I hope someone can help, as I have to make a decision this Friday on which system to use, and i really don't want to go with Prestashop.
Thanks, Izzy