I don't understand why when I go to edit a note in the MIDI screen and then save it, it does not keep. I am in the notation window and want to extend the time of some notes where I right click on the note and select "Edit Note." I extend the Duration to 7, click Ok. The note appears that way onscreen. Then, when I go to Play, the changes disappear. What is causing this?
The same thing happens when I want to slide a note from its original place to another. The screen accepts what I am doing until I go to Play it.

I should say I am using 2010.