Template params ($this->API->get) issue

Hi,

Storebox 3.9.2
Joomla 2.5.14
VM 2.0.22C

I've spent a lot of time investigating this wired issue. On all pages getting template params, I mean $this->API->get($key, $default), works fine but not on Virtuemart category view, manufacturer products view and product details view. All $this->API->get variables returns always default values or if I call param without default value it returns nothing. I think it's mainly question to Gavick Team members - do you have any idea why it doesn't work properly?
I've already tried to disable other modules, plugins etc. with no luck. Also it isn't javascript conflict because all js are same on all pages (checked all of them), what's more I've already tried firebug and chrome console and it doesn't show anything special. It just doesn't take template params on that pages (all of them - template width, main menu effects, sidebar width etc.). Rest of functions from helper.api.php works fine. I'm out of ideas. Please help me.

Best regards

Could You please switch to original Beeze template for testing and check if problem resists?