Configuration fields not saving in Joomla 2.5

I've installed HikaShop Essential into a Joomla 2.5 website. There are a number of fields in the configuration / setup of the shop that just won't save. I am using a Firefox browser.

Here are some examples:

Configuration Main: Main currency and main tax zone refuse to save when I put in Australia and AUD respectively.

This is the error message I get. "Your checkout workflow is empty.
Checkout workflow invalid. The modification is ignored. See the documentation for more information on how to configure that option
No valid weight unit entered. The system put back the default units.
No valid dimension unit entered. The system put back the default units.
Successfully Saved"

When I go to checkout option there are boxes in the workflow area and weights and dimensions of products have been entered.

The Australia post plugin does not seem to work properly.

There are also sever other shop configuration options that are not saving eg "mini shopping cart" etc.

Would be most grateful for some assistance on this.

Thank you. Using IE allows me to save the page.

Re Australia Post plugin - I will need to test this a bit more but it seems to give me the same postage amount irrespective of which post code I put in - but, as I mentioned let me do some more testing on this before I get back to you.

nicolas wrote: Hi,
Please try with another browser like IE to save the configuration. It should hopefully work.
It seems that for some strange reasons on some websites the saving doesn't work properly but we couldn't replicate the problem yet on our end.

I'm having the same issue with Safari. Works in Firefox.