Enable Dynamic Thumbnail Resizing in VIRTUEMART?

I want to show the product description in virtuemart thumbnail image is 90x90 px and when clicking on the image will be enlarged to the size of the original image 800x600px.

The virtuemart I use is the version 2.0.18a. and in virtuemart template settings I have enabled the option, Enable Dynamic Thumbnail Resizing?. It happens in this particular Coffe template but in the other templates that I use virtuemart happens, for example in the template boutique puts the thumbnails well.

Hi,
please in boutique template go to htm/com_virtuemart and change name of this folder for a moment. Then please check if problem still exist and let me know.

I can not, I make the thumbnail display in the coffee template when displaying the description of the product, and when clicking on the image extends to the original size of the image. I note that in the folder .. / template / gk_coffe / html not com_virtuemart folder which gk_boutique copy of the template to the folder .. / template / gk_coffe / html, I still function funcianar the thumbnail image in the product description.
Note Perform two tests and still not working:
1. - Copy the folder com_virtuemart of .. / template / gk_boutique / html to the folder .. / template / gk_coffe / html.
2. - Copy all folders that are not in the template com_virtuemart of coffee from .. / template / gk_boutique / html to the folder .. / template / gk_coffe / html.

Please give me url to your website. And send me Private Message with access to your joomla backend. Remember add link to this topic too.

Hi I would like to know how to make the thumbnails larger please