HI Leonie, we tried the Enable Flex and no difference. We did notice that turning off the volume control points changed the color of the tracks away from dark blue - so one mystery solved.
We than happened to try a cut that did not include the first bit of the track, and it worked. When we tried to clip off the first part of the track by highlighting and tapping delete that did not work. Not sure what that's about... so, we simple isolated the early bit and double clicked it to select, then deleted.
We're back into editing again. Thanks for the help and every day I'm learning more about this program...
Cheers,
Fred