Apart from the directory path problem, which I also ran into, two other issues with ripping with Good or Medium settings is that the mythdvd calls transcode which in turn uses xvid to compress the video. If transcode and the xvid libraries are not installed, it will rip the dvd but not transcode. Perhaps transcode and the xvid libraries need to be made dependencies of mythdvd.
Apart from the directory path problem, which I also ran into, two other issues with ripping with Good or Medium settings is that the mythdvd calls transcode which in turn uses xvid to compress the video. If transcode and the xvid libraries are not installed, it will rip the dvd but not transcode. Perhaps transcode and the xvid libraries need to be made dependencies of mythdvd.