We have identified the issue as being caused by the Innity passback tag for adunit 394006. Whenever a fallback call is made, and the passback tag is used, it returns:
innity_pub='413';innity_exclk='1383656107';document.write('Invalid Domain Name');
It is not connected with the geo location, we tested it out from a few different locations and every time a passback was used we saw the invalid domain response (it is, however, hard to get a passback tag with the geo-location set to japan, that is why you weren't seeing it).
I would recommend you to contact Innity asking them what might be causing the tag to return such response and clear it up with them. Feel free to include me in any communication or ask for any additional details we could provide. Below I attach the call that returns the invalid domain response: