Google markers and clustering just stopped working?!

[Andy]

Hi

I have a few sites that plot markers on the google map, some are clustered depending on the zoom level and the markers proxity to each other.

http://www.pearsons.com/

Today, without anything changing only the first couple of markers are plotted?

I have debugged locally and all seems fine, this has happened across a number of sites which use the same scripts none of which have been updated since they were working correctly.

Any help/advice appreciated.

Andy