when I've laid a track between two components, and then want to remove that track I've normally just deleted one of the segments along that track, and then used "Edit->Cleanup Tracks and Vias". I assume it is the "Delete dangling tracks" option that is the one that then has removed the rest of the track.
However, in the recent nighly versions this doesn't seem to work anymore. I still have partial tracks after using "Cleanup Tracks and Vias". Is it just me?