Hey enamoured! If my adapter did that I would have kept it.
Mine would get to 99 then the next song would display track 0 (like you say) but it would be the first track in the playlist again. I could just keep tapping the up arrow and it would go round and round the same 99 songs! Up or down. Really frustrating. Might be because I use a 5G ipod - i dunno.
Glad yours works for you - but yeah the 5 playlist thing is a bit of a dud.
mcewen98 - does sound like a there's some variability in these things. I guess it is possible they installed the wrong one. What does preset 6 do? It is supposed to play all tracks I believe ...