If you want the most up-to-date copy of RGraph with up-to-the-minute features the beta version is available. This is less polished than the stable version and may be lacking some documentation for new features.
You now need to go to the preview version of the RGraph website to get the beta version of the software. Feel free to have a browse around - particularly in the /demos/ directory to see the latest new demos.
Occassionally backwards compatibility has to break - you can read about those breaks here. http://www.rgraph.net/docs/backwards-compatibility.html