When using midi transform to halve or double note length, notes just disappear

[Thorny]

I am trying to double the length of notes in a phrase. I select the 4 bars of the phrase, click on midi transform and select half speed. When the window opens, I click on "operate only". The notes just disappear. I attached a screenshot the transform window. I have watched videos where it appears to work that way exactly, so I am at a loss.

[David Nahmani]

You should either specify a position or click the action menu at the bottom left in the MIDI Transform window, and choose Selection defines position and/or pitch range. 

[Thorny]

Thanks for the very quick response, David! unfortunately, that choice is greyed-out.

[David Nahmani]

1 hour ago, Thorny said:

unfortunately, that choice is greyed-out.

That's probably because your project file was started in an earlier Logic version that doesn't support that feature. 

Then you have to specify a position. First, in the action menu, deselect Hide Unused Parameters.