Yes, same issue here, after the two java security updates, one released by Apple the other by Oracle
I am on Mac Os 10.8.4, R 3.01, JGR 1-15, deducer 0.7-6
I found a preliminary fix. Downloading the current JDK as a dmg from Oracle restored the responsiveness of the menu and brought back the full functionality of the buttons.
Please be careful, when selecting the downloadable java versions, the complete JDK 7 is required, JRE is not sufficient.
When I open JGR by double clicking on the JGR icon, it displays an RJavaClassLoader instead of JGR.
That is still a bit strange, but at least I am back in business and able to continue to work with deducer until somebody comes up with a better solution.
Wouldn't like be without deducer, which is a great GUI and has become an indispensable tool to me when working with R. I really appreciate what Ian Fellows has done here for the R community.
Many thanks to Ian.
Rudolf