tranced resolved his own issue and posted the resolution here for others that may have the same question - it was not directed at you.
Perhaps someone more experienced than I will chime in here to help you, but in the mean time, might I suggest you check your image file naming process? I suspect you may have a file naming conflict that is confusing ZC, resulting in the wrong images being displayed.
Hint: it is unnecessary to use _MED and _LRG file extensions with IH3 and it is required that you only upload one size image per product image - usually the largest - and allow IH3 to re-size the images for you, based on the settings you choose in the IH3 Configuration settings in the admin.
IH3 has an in-depth tutorial about how to name and file your images when using IH3. Take a look at the Troubleshooting tab, second section entitled "Prepare Your Site For Growth".
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