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 too have been struggling with the added gm-styles and Roboto font loading since 3.14 was introduced.
Found this issue reported as a "bug" on the google maps API codebase. Please star and comment on it at http://code.google.com/p/gmaps-api-issues/issues/detail?can=2&start=0&num=100&q=font&colspec=ID%20Type%20Status%20Introduced%20Fixed%20Summary%20Stars%20ApiType%20Internal&groupby=&sort=&id=6078