Windows 7 Desktop, Ethernet connection to 18meg broadband.
The (Beta?) Client is behaving badly for me - mostly it's problems that are impossible to recreate such as selecting a track for playback but getting a track from a diffrent album in the same atist's view. This happens only occasionally, sometimes repeatedly getting it wrong, sometimes getting it right after making the selection a second time. I cannot give specifics that would allow anyone to re-create the problem.
Here is a screencap of a track that is highlighted in the Artist's view and show as playing in the details relating to the transport controls - yet is not the the actual track playing. While I could get this to happen several times (by doing a couple of track skips from the first to the second album) sometimes it gets it right. Skip on from this track in the first album to try and recreate: