Cubase SL Tempo - vertical position line ?

Cubase tempo change - 2.jpg
cubase sl tempo - 1.jpg
I have attached two screenshots showing tempo changes in SL. The first shot is from a project where the tempo track change does not have any affect on the song playback tempo. The second shot is from a project where the tempo track changes DOES affect the song playback tempo. Why isn’t the first project tempo change changing playback tempo? And why in both shots does the position of the vertical line in the tempo track not match the position of the vertical line in the project window? Shouldn’t they be the same?

I’ve tried changing from Bars to Beats. And I’ve changed the VSTi assigned to the track with no difference.

Thanks,
Tom