One thing that stands out is that there are 2 script tags for the api and your key.
This one is incorrect
as it is missing the '=' sign after key. Is this in your template file?
So i figured out a way around this once before but recently updated my silverstripe build to 2.2.3 and am having the problem again. My map works fine in IE7 but won't show up in FF or Safari. It seems like there is an issue with a double quote in the wrong place or something. I'm just wondering if anyone else has had a similar problem when dealing with the gMapPage.php spenniec provided. You can see what I'm working on at jazzat5.org/site/location/. If you check out the source you'll see FF shows all of the script code in pink.
I've copied the code from the view source page FF creates and plugged/posted it as a .html page. When I view it the map it shows up. There is literally no change between the code generated and read by FF the first time or the code works.
Any thought would be greatly appreciated. Also Spenniec, your example link http://www.mccauleys.co.nz/ no longer works. It turns up the following error:
Fatal error: Class 'Page' not found in /home/.mummy/cms_dc/2.2.1/cms/code/PageTypes/UserDefinedForm.php on line 3