Crash on advancing to next chord symbol with no chord symbol entered
1) Open last nightly: OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 188.8.131.5228, revision: 6c1e675
2) Enter a quarter note and a chord symbol
3) Navigate with Space bar.
Result: Sometimes the program shuts down after two keystrokes, sometimes a little more (here, on the GIF, at the beginning of the second measure).
Other times, you have to go back and forth over two measures with Space and Shift + Space, etc.
In short, there is something unstable.