I'm using the GMarkerManager to handle zoom levels on an embedded map, it's working fine in Firefox and Chrome but will not load in Safari 5 OSX. I'm a bit stumped as it's not giving any errors in the webkit developer tools.
The page is here http://www.propertyglobalsearch.com/map-of-property-for-sale-worldwide.html
EDIT: I tell a lie, it works intermittently in Safari 5. If you click the Holiday Properties button, then the Sales button the markers load. It seems like something is not being loaded in the right order, or is missing at runtime?