[coppercup]

This is just off the top of my head, without looking, but that means the product_thumbnail.tpl is used for the category product list thumbnails as well as the product detailed images thumbnails.

That being the case, if you want them to be two different sizes, the best solution might be to make a duplicate of the product_thumbnail.tpl, name it something like product_cats_thumbnail.tpl, change the thumbnail dimensions, and then reference that template instead of the original in the template that builds the product list (can't remember the name of that template off the top of my head).

Glad you fixed your other problem.