Switching Confirmed to Shipped = CRAZY screen?!

-- url of the page with the problem -- : www.fieldtestedgea.com/
-- HikaShop version -- : 2.3.4
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.5.22
-- Browser(s) name and version -- : Safari 8.0.5
-- Error-message(debug-mod must be tuned on) -- : none specifically

Hi Nicolas,

When I go to the backend and choose an order's status and try to flip it from Confirmed to Shipped, a popup shows up but I get what you see on the screen shot - a blank popup and seconds later - a squashed version of the site's front page...

What could be causing this?
I'm assuming it's a permission issue but where/what?

Note: The site was transferred from one hosting company to another 3+ months ago but it was working fine after that
to my knowledge.

That was on Joomla 3.3.6 though, and now we are on 3.4.1 if that matters?

HELP,
Sincerely,

Emmanuel Lemor for Michael.

Hi,

You should update HikaShop to the latest version ; just to be sure to have the patch for Joomla 3.4

Regards,

PS : You will find dozen of threads talking about that Joomla 3.4 popup issue in the forum.