Compatibility problems with 14.4.1 (running on MacBook with M3 Pro

Problem 1: the dragging “hand” disappears if the project is not saved immediately after each action.
Problem 2: you cannot modify the tempo of only one track from the bottom time signature tool. It gets applied to all of the tracks.

I’m not sure what you mean by “dragging hand”.

As for the other thing: To modify the tempo of a single clip, press Option and drag the edge of a clip to the desired position.