Can't get split range to work. Drives me crazy.

Example:

Start new project.
Create audio track.
Drag audio file to track.
Double-click to edit. Sample editor open up.
Selecting a range.

What happens now is that ALL selections under edit-range are greyed out except for Insert silence.

However, it works if I close the sample editor and use the range selection tool on the audio track.


What am I doing wrong?!?