helloUK:
I have a same problem. I am using template from monster but I can not show more than one products per row in home page. Also I can not show any additional images in product info. All of these works in classic template but not template monster.Try searching on Template Monster and you will find that you are far from being alone in having these issues.
However, to some extent you're trying to go against how the Template Monster designers have designed many of the templates. They tend to use wide side columns and load them up with attractive sideboxes and place less emphasis on the products. IT is quite possible that your particular template won't support multiple products across, without custom coding.
It would be a shame though if you couldn't make additional product images work on the product info page. There's no good design reason to remove that functionality - quite the opposite. If you go into your tpl_product_info_display.php file, do you see a line looking anything like this?> require($template->get_template_dir('/tpl_modules_additional_images.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_additional_images.php');
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