Chord name bug and workaround
It is already known that there is a chord name bug; it is stated in the README file in the downloads section. I have found a workaround.
1. Press "Control" "K"
2. Enter "C"
3. Press the spacebar
4. The C disappears
5. Press "Undo" until the note where you input the chord name is highlighted blue. Then press "Redo"
6. The C should appear around the top of the page
I exit chord name mode by clicking an empty spot of the score. I usually have to press undo twice to return the selection to the named chord.