In google maps version 3.14 there are some new css rules added for the custom infowindow. I use the infobox plugin and now many of my elements styles are overwritten.
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I had the same problem and Emads answer worked well for me after I addet a event listener.
google.maps.event.addListener(map, 'idle', function()
{
jQuery('.gm-style').removeClass('gm-style');
});
The problem is I still can't see any way to stop google loading the Roboto font.
EDIT: Well... there is a pretty easy way, to stop that. Just use GET to load an older version of the google API like this:
In this API verion, google won't change the gm-style at all. So you don't need to override any classes or styles.