It looks like something got broken during the installation. The page is aborting before being fully displayed.
I suspect that things will work again if/when you revert back to the original 'classic' template.
If you happen to recognise the following piece of code:
<!--bof Additional Product Images -->
As being a part of one of the files that you edited/replaced, then that file is the culprit. The cause of the problem could be something as simple as a blank line inadvertently added to the end of the file.
The best way to get your store back online as quick as possible will be to restore/reinstall your template files. In fact you should make this your priority. You can come back and re-install IH later.
Cheers
Rod
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