This plugin provides access to google API for fonts to provide access to these fonts on your website.
Please specify as much information as you can to help us debug the problem.
Check in your error.log if you can.
Check out the Google Web Fonts Manager Plugin for WordPress Video:
Developer Website: http://MyWebsiteAdvisor.com/
Google API Key Setup Tutorial: http://mywebsiteadvisor.com/learning/software-tutorials/google-web-fonts-manager-plugin-for-wordpress-setup-tutorial/
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