Might be because of high CPU usage some experience with the last.fm scrobbler.

That's odd, I don't have any issue with gapless playback and the last.fm scrobbler using the latest MM4 build and the latest scrobbler.

It seems that I have found the problem. It seems that the LastFM Scrobbler was causing the issue.
This is a shame because I liked using that but I suppose I'll just try to find another way to use it.

I've just reinstalled MM4 (upgraded to the latest version). I did this because I was having a problem with there being a slight gap between songs when I knew that there shouldn't be.

Not I have reinstalled it is even worse than it was before. I tried renaming the scripts folder in case it was something there but that made it much worse, which seems strange.

I suspect it might be something to do with AutoRateAccurate script, which I previously installed and then uninstalled but I have noticed that under the auto DJ options there is an entry for this script still.

Would it be worth deleting my database file and rebuilding? If so, how can I back up my playlists?