Playing technique vanished!

Hi!

One of the playing techniques has suddenly disappeared. The little circle that indicates to open the plunger mute. I haven’t got a clue how to get it back. If I start a new project it is gone. Older projects it’s there. Anyone with an idea how to get it back!?

Switch to Engrave mode, then go Engrave > Playing Techniques…
Select the appropriate section and technique (probably Brass > Open). Then click the Revert to Factory button at the bottom of the left list - it’s the fourth one along from the left, between the Star and the Trash can. Finally, click the Star.

Thanks, you saved me hours!!