Have tried that, have deleted ALL extensions and have re-installed just eCart.
It happens when I am using the checkout wizard. Alway on the confirm_cart.php page normally when the wizard shows building cart.
See attached photos I have kept everything to a minimum to test this.
I am using:
IOS: OSX Yosemite | Ver 10.10.1
eCart Ver 6.1.0
I really need to get this sorted out!
The only reason I got this cart is because Eway said it was supported.
Thanks for your help, as you can imagine I'm very frustrated as the dead line for this site is very soon.