Also — I did find a similar issue reported in August on WordPress.com — a tech seems to have solved it but the problem seems more widespread now…
http://en.forums.wordpress.com/topic/google-maps-4?replies=37
The topic has been closed so I don’t see a way to get that tech’s attention, unfortunately.
Same thing is happening to me, example here:
http://www.berkeleyside.com/2013/10/01/ceasefire-walk-against-violence-comes-to-west-berkeley/
I’m using Mac 10.8.5. I believe it’s a Chrome issue — latest version 30.0.1599.69. This just started a couple days ago. I have no issue with the same map in Safari. I have previously embedded many google maps with no problem in any browser, so something must have changed recently with either WordPress or Chrome. I’ve tried re-pasting the code multiple times to no effect. And since it works in Safari, it doesn’t seem there’s anything actually wrong with the code.
As noted previously, there’s just the “loading” message but the pins never appear.
Hopefully this can be resolved quickly!