[SOLVED] variant selection doesn't work

-- HikaShop version -- : 1503061200
-- Joomla version -- : 3.4.0
-- Browser(s) name and version -- : firefox 36.0.1
-- Error-message(debug-mod must be tuned on) -- : none

Hi,
I've just updated my site to joomla 3.4.0 and to the latest Hikashop version available at this moment (com_hikashop_business_v2.4.0_2015-03-10_12-55-10).
On products with variants, I can't get the product's description shown and the dropdown selection is not processed, wich means I don't see any image change related to the variant I choose, nor I get the proper variant in the basket if I add to cart.
Basicly I get the title (product name), the first variant image, price etc., variant dropdown selection, add-to-cart button, description of variant shown. If I select a different variant nothing happens and if I add to cart I don't get in the basket the variant selected but the default variant (which is the first in the backend show order)
I'm using the Hika default layout, no modules are published and no special plugin are published (that I'm aware of).

I don't get any error messages.

Any hint?

Thanks in advance,
claudio
P.S. As the site is offline due the updating let me know how I can give you the access data.

Hi Nicolas
Thank you so much.

I don't know, maybe I resetted the "show_default" view instead of "show"...
Thank you so much!

Best regards,
claudio