The credentials provided for the GoogleAnalytics source are invalid.

I've got a GA data source but it won't refresh the data. While it does work sometimes the majority of the time it reports an the following error: Data source error: The credentials provided for the GoogleAnalytics source are invalid. (Source at GoogleAnalytics.) I've double checked the credentials and they are fine, for some reason it just refuses to update. From the forums I've read I'm not the only one experience this but have not seen any fix reported.