Alright, so I implemented an adaptiveResize module (https://github.com/wearefarm/magento-adaptive-resize). I think I have it installed correctly.
I am actually using large "thumbnails" as product images on my site because it seemed the easiest way to get multiple images per product. So altering in product images I am altering the thumbnails.
Okay, so I go to app/design/frontend/base/default/template/catalog/product/view/media.phtml and change the thumbnail's resize function to adaptiveResize. But now all those images are loading as the default Magento placeholder. Boo. Changing back to regular resize fixes the problem.
I renamed media/catalog/product/cache to force the site to create a new cache folder. It has done so, but inside its created an image and small_image folder, but no thumbnail folder.
My .htaccess file has memory limit set to 512M. I don't seem to have a php.ini file (or I don't know where it is...) but there is a php.ini.sample, which also has memory set to 512M.
Any ideas? Are the photos just too large?
site is at cart.oldfloridian.com. Category images also are acting up after implementing this module (http://learntipsandtricks.com/blog/magento/121/How-to-resize-Magento-e-Commerce-category-images) - perhaps the same cache issue?