Unless you have modified your store in such a way that IH3 would be rendered inoperative, messing with these files is not the issue.. IH3 works out the box with only image settings being the only thing you have to "do".
Please post the links links to where the problem with your site exists, and post your image settings..
If no one here is able to help you resolve this, then my suggestion os to give some thought to paying someone to help you get IH3 installed and configured correctly. Unfortunately none of us can see your site or your install to say FOR SURE what is going on. We can only look at the information you provide and offer suggestions based on what we know.. BUT if the issue is some kid of install problem, we can't "see" your store to know where the issue lies..
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