Doug asked for a volunteer to replace him, but no one volunteered, so there is no longer a manager of the map. Anyone can contribute (or mess it up

).
That probably doesn't matter, since the map itself is still working and only the embedded version fails, but the code to launch the embedded version may be tripping over an inappropriate change made on the Google Map by a user.
I did notice that in the sharing settings, the map is set for
... which is the desired setting; however, it also has an owner - someone (an individual's GMail account) listed as "Is owner" - that would likely be an issue.