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    <ol> <li><p>Ideally you should wrap the code that loads the map inside a document ready or window load event.</p></li> <li><p>I notice that your code is not nested properly inside the <code>GBrowserIsCompatible()</code> block so please fix that.</p></li> <li><p>As far as I remember, Google maps API v2 requires you to call the <a href="http://code.google.com/apis/maps/documentation/javascript/v2/reference.html#GMap2.setCenter" rel="nofollow"><code>setCenter()</code></a> method before doing any operations on the map. So to begin with, set the center to <code>(0, 0)</code> immediately after creating the map.</p></li> <li><p>I notice that you're downloading XML data before you add markers to the map. You must take into account the time taken by the server to serve the XML data. If you've called the <code>setCenter()</code> before downloading the XML, the map will display while the XML downloads asynchronously. </p></li> <li><p>Inside the code that handles the XML data: when you add a marker, do not call <code>setCenter()</code> immediately. Doing so will cause the function to be called 1000 times if you have 1000 markers in your XML. Instead, just call <code>latlngbounds.extend(point)</code>. Once you have iterated the loop, calculate the zoom/center and call <code>setCenter()</code>. This way you will end up calling this function only twice.</p></li> </ol> <h1>Edit</h1> <p>I've figured out what the problem is. The genxml.php <em>randomly</em> returns the string <code>Google Geo error 620 occurred</code> which cannot be parsed as XML which raises JavaScript errors and no markers are shown. Better have a look at the code of that file and see why this happens randomly. On other times when that file actually returns valid XML, the markers appear as expected.</p>
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    1. POGoogle Maps load issues on PHP page
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    1. USSalman A
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    1. POGoogle Maps load issues on PHP page
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    1. COThanks Salman. I've amended the code and when I added a line to setCenter (immediately below the map.addControl(new GMapTypeControl()); line) sometimes the map loads in FF with no markers, but upon refresh the map will load properly. If I refresh again, either the map will load on it's on with no data, or it will load properly!
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      1. USAdrian Johnson
    2. CO@Adrian: The map should load after you call setCenter. I set the center after calling new GMap2 and before adding controls however I am not sure if this has something to do with the problem. The markers load sometime after genxml.php is loaded. Does firefox give you an error or something (press CTRL+SHIFT+J or use FireBug). Also try adding this line in the beginning of the function that is called by GDownloadUrl: `if(data === null) alert('genxml.php failed')`.
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    3. CO@Adrian: I've edited my post.
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