When an album is ripped as a single file with a matching cue file, JRiver displays both the album length flac and the tracks specified in the cue file. If you add the album to the playing now list, the tracks in the cue file and the whole album are added, doubling the playtime and effectively replaying the disc. JRiver needs to intelligently filter out the whole album flac file and just render the cue file.
See the attached image.