Re: Japanese or Chinese?
After looking into this further and communicating with Google, here's what they have reported back to us:
This issue is fixed and will be released in early December. The exact ETA is still unavailable because there is a code freeze in place for the rest of the month.
The issue is only seen with certain versions of IE. In certain situations when text ads are rendered the encoding that describes the format does not get set correctly. This causes the unexpected foreign characters.
It is worth pointing out that this is also occurring for a few other publishers as well but on a small scale.