I'm using ZenCart 1.3.8. I don't know what has and hasn't been customized... the work was done for me. I've looked through the FAQ's and found related issues, but the solutions either weren't appropriate or didn't help.
Here's my problem. I recently changed the way my products are organized, moving some from one category to another. Now, on my main product listing (the one that shows all categories, all products), the row of products goes off the right side of the page, rather than wrapping at an appropriate width. This wasn't a problem before because no category had more than 3 items in it. You can see the problem here:
http://store.magidahwear.com/
How can I get the longer row to wrap? I've used Firebug to try and figure out precisely what style is causing this, but to no avail. If anyone can offer some insight into the problem, I'd be most grateful.


but it's working well enough now. 
