[Google Maps API v2] 404 Error Loading Google AJAX API Loader

I have a Google Maps API v2 application and am using the Google AJAX
API loader to load the maps API.

My script tag to load the AJAX API Loader API looks as follows:

<script type="text/javascript"
src="http://www.google.com/jsapi?key=my_key_here"></script>

The application has worked fine for several months.

Now I'm getting a

"google is not defined"

error in subsequent reference to

google.load("maps", "2");

I issued the

http://www.google.com/jsapi?key=my_key_here

request directly from my browser address window and got a 404 error
response.
If issue the request repeatedly I eventually get the desired
response.

Thinking it might be a network problem, I VPN'd to another network
and issued the same request from the browser - works every time.

Any thoughts on what is the problem?

--
You received this message because you are subscribed to the Google Groups "Google Maps API V2" group.
To post to this group, send email to google-maps-api@googlegroups.com.
To unsubscribe from this group, send email to google-maps-api+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=en.