I’m on page 28 of the BIAB for Mac User’s Guide. I’m stuck on the section that says:
“The Favorite Instrument Panel allows you to assign up to 10 of your favorite instruments for each instrument part.” I'm pretty sure I followed the instructions step-by-step, but I couldn’t get my new assignment to “stick.” I was trying to change the sound of the instrument #1 in the Melody part from piano to marimba. Here’s what I did:
• Clicked on Melody
• Moved pointer to instrument panel box (Mel: (1) Acoustic Piano) and clicked on it
• Selected Marimba from the drop down menu. The name in the window changed to "Mel: (13) Marimba" and the sound changed to Marimba as the track played.
• Pressed numbers 2, 3, 4, etc. in turn to hear the other instruments. No problem.

When I went back to and pressed number 1 again, the window reverted to "Mel: (1) Acoustic Piano" and the sound changed accordingly. Why didn't Marimba play? I even tried typing Cmd S, no luck.

What am I doing wrong?
BIAB 2010.5
160GB External Drive
MacBook Pro
Version 10.5.8