HI Milos,
I just can not solve this. I don't understand why there is no formatting on the checkout page, the cart pop-up message when a product is added (and I couldn't compare the profile, registration section of the demo but I don't think mine looks right).
Can you please take a quick look:
devshop.bellussi.com
I even tried setting a standard style like orange or red but it doesn't solve the problem.
The other way on another server I tried installing Joomla 2.5.1 and vm2.0.2 from the beginning (without updating like i did this version) but if I install the hot cosmetics template without the hotstart then nothing shows up at all and I think it will take a long time to set everything up.