Ouch, for the star.gif you need the full path, since the relative path has changed:
/wp-content/plugins/gwolle-gb-addon/assets/rateit/star.gif
I am not sure about the buttons, could you add these lines to them?
font-size: 18px;
line-height: 46px;
min-height: 40px;
padding: 0 20px 0 20px;