The "FRAMES" and "NO FRAMES" link in the navigation section of the generated documentation pages is not working correctly. If you are looking at a class documentation page in the frames view and then click "NO FRMAES" and then again click on "FRAMES" link, the class documentation page is lost in the right hand frame and the overview-summary page is displayed in the right hand frame.
This used to work correctly before and was introduced as a part of fix for bug 8074521 where the loadFrames() JavaScript was deleted while converting the frame and frameset to iframe.