N-Serve Always Shuffling Tracks

I have an HDX and until recently have been controlling it with Desk Top Client. 

I have just got myself an Ipod touch and loaded N-Serve.  Everything is working well except that I cannot get N-Serve to play an album straight, in the correct order of tracks.  When I select an album I get the "play album" and "shuffle all tracks" options.  If I select "play album" I get the first track on the album but then I start getting tracks at random.  I can't think what I might be doing wrong and it's starting to drive me nuts.

I'm talking about CD albums that I have ripped through the HDX and which play perfectly well through Desk Top Client.  It's definitely an issue with N-Serve and not, say, with the way the tracks are named or numbered on my hard drive.