Sheila -
I'm not an expert but:
I'd try going to admin/config/images and make sure IH is turned on. At the bottom of the list of options are several that start with IH and the one right about that about proportioning
then go to admin/tools/IH manager (making sure it is installed...) - then pull up and display products using the IH manager - at the bottom of the page it will show you the small medium large images - IH does not use the same image folders as standard zencart
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my non-expert offer to other folks having issues is to reinstall the files, make sure you don't have any old files, (IH manager will look for you from admin) and see if that helps -- IH is quirky for me too but I'm a total convert now.
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