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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In response to dorr Baums solution, for those using prototype js you can use the following to remove this class.
google.maps.event.addListener(map, 'idle', function() { $$('.gm-style').invoke('removeClassName', 'gm-style'); });