Can't select Associated Category

Hi HikaShop,

I'm experiencing a bug. I'm in the middle of creating a "Menu Item" and enter the "Hikashop Options"; everytime I tried to select the Associated Category it keeps redirecting me back to the "Content menus" list.
Here's what I experienced:
1. Create a new Menu Item. Name it with "Fish For Sale". Save it.
2. Go to "Advanced Options" - "Hikashop Options"
3. (now we're in the "Content menus" of Fish For Sale) .. I tried to select "Associated Category" - click on "Select"
4. I'm automagically redirected to "Content menus" list.. No chance of viewing the Category at all.
5. Repeat step 2, and ended up to the same location again.

The Category I was trying to select is also "Fish for Sale". I confirm that Category has been created before I create the Menu Item.

I'm using:
HikaShop Starter 2013-05-09
Joomla 3.1.1
IE, Chrome, FireFox all the same error


Can you please help me on this one? I'm frustrated with this funny thing.
I also have another site with the same version of HikaShop but using Joomla 2.5.11 . In that site, everything's working perfectly.


Many thanks in advance.