MIDI tracks don't constrain to measure when changing tempo

Can anybody help me out here? I’m doing a session in C7 on my PC, and when I change the tempo via the tempo track, my drum patterns (one-bar kick/snare pattern, for example) don’t change in proportion with the tempo change. In other words, it moves around, and the start/end of the pattern are no longer consistent with the given tempo.

And to further confound things, I can’t find a track time base setting button on my MIDI tracks.

Attached is a photo of what the track looks like in the editing window.

Thanks in advance to anyone who can offer a bit of help here.

midi track picture.jpg

OK, got it. For anyone else’s benefit, somehow the time base setting button on my tracks was set to hidden, so I right-clicked each track and moved it to visible.