I've removed IH from the database, deleted all files and installed the latest (September) version, but I'm still having this problem.
All small and medium images work fine, as well as image hover. The problem is with large popup images on the product pages. They're supposed to open up at a maximum of 600px width or 550px height.
Image Handler admin shows the large images as being resized to the correct proportions. All seems well.

However, the products' large popup images still open up at the original file's size (e.g. 626x1000).
I've cleared the image cache through IH admin and through FTP dozens of times, reinstalled Image Handler, and replaced modules/pages/popup_image with the original code. I don't know what else to try!
:frusty:
Any help would be much appreciated!