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I’ve just checked the code and the issue is in the plugin. I don’t like to to much into detail but basically the fix_tb_dimensions in the igw.js file doesn’t check if the button element exists and causes the error. There should be an easy fix (http://pastebin.com/6KMDcq56) but this has to be done by the author.
You open a new support request called “fix_tb_dimensions causes error on CPT” and post a link to the pastebin code.
Hope that helps!