OK for both of you it seems to be the same problem. The custom product_listing.php file I included is not being loaded. The only change in my custom product_listing.php file is that I force the inner width of the div to use 100% of the div so you don't get the skinny text. In looking at the source code on both of your sites, I can see it is using the default size instead of my size.

Please be sure that you are uploading it into a folder of the same name as the template you are using.

For example. If your template is
/includes/templates/silverfish/
then you need to put the product_listing.php file into:
/includes/modules/silverfish/product_listing.php
for the override to work. You should have to replace the one that Dr Byte included with the Column Grid Layout.

If you still can't get it working, perhaps you can set me up as a temporary ftp access and i can see where the disconnect is.