Oops! I apologise for mis-quoting the error message, I was trying to remember what the message was as the machine was not in front of me when I posted the original query. The error message does seem to be displayed whenever I select a different playlist and set it to play, which I guess means every time it makes an initial read of the disk, oddly though it doesn't seem to display the message when it reads each track in the playlist, just the initial read for the playlist. (Incidently it did this when I loaded Hijack version 426 as well, which was why I re-downloaded the ver 2.0 consumer image and reflashed the machine with it and then downloaded and installed Hijack 431, so I was surprised when it did it again.)