Product thumnails not being generated on 1.5.2

Hi, I appear to be having problems when I add images to products, I would expect the products to be displayed as thumbnails on the product category page - but they dont. The images are only shown in full on the main product section. I have spent about 3 days trying to figure it out and adjust settings, but it doesnt seem to work for me. I have also searched through all of the forums as well. Do you have any ideas?

Here is the site area

rccguk.org/index.php?option=com_hikashop...t=listing&Itemid=248

Hello again. Thank you so much for your prompt response, this is so kind of you - and no doubt I'll be upgrading to the professional version. However, just one slight other thing. I did all that you have suggested and Images now show up on the Products Listing Page. However, it appears that when I actually go into the product, I get the 2 images listed: 1 in the description (which is what is displayed in the Product Listings) as thumbails, and also the original image - which has been displayed in the "Images" part. Not too sure how this can be altered. I have included some configuration images again. Please find attached images (file attachment) of what I actually mean.

Would be so grateful for your help

Hi, thanks for the response...but if I do that, then the
Image will not be shown as Thumbnail in the Product Listing area. I think
What I think I am trying to achieve is to have a thumbnail image of a product
On a product listing page and then when the user
Clicks on the thumbnail they would then be brought to the full product with
A larger image. I suppose this could be an add on
For a future release?

Hello again. I am so grateful for your help. This has now worked and I am very happy with your quick response. You certainly need to knock the other competing product (VM) off the top slot at Joomla.