I'm on an edition of Finale v. 25.1.0.183 purchased on Cyber Monday, on a Windows 10 computer. I haven't taken the latest update.

I open up the woodwind quintet I'm working on, everything's good. A few minutes later, the french horn is being played in Db. I'm not touching any settings, and the second time, I think the only thing I did was change the playback starting place. I can't continue working on my project with a deadline because I am terrified to click save, and lock in this bizarre change that I don't know how to unchange.

Any ideas?

Thanks