Thank you VideoTrack and Floyd Jane for your replies.

I confirm that my preference settings are as suggested and there is no significant tempo change between my earlier project and new project.

This is somewhat frustrating now. I find a style I like and when opening a new project I select that style again and it's all different. I have to go into the Mixer, select each track, go to RealTracks then select the correct patch. The correct instruments are then loaded but the tracks don't update with the correct descriptions.

I'm certain I've never had this with previous versions. I realise entirely this might be something I've done or am not doing.

I'll continue trying different things starting with a completely new project and, possibly, a full uninstall and clean reinstall.

Thanks again for your suggestions.