I am having an issue with the product listing page showing only rows. I upgraded from 1.38a to 1.54 and now when I click on a category it shows the images in a row instead of a column. I tried the Flexible Product Listing plugin but it didn't seem to help the issue. I even changed the index listing > Show New Products - below Product Listing and this showed up correctly (columns). I have php version 5.4 and the version 1.54 of zen cart.