Please send us a detailed bug report of what you were doing at the moment of the crash, along with any crashlog, in either the forum, the chat or the Github issues (preferably). Thanks !
Check that you do not have the JACK2 ASIO driver installed. It is known to cause crashes on startup on Windows for many software. You can check the following registry key in the Windows registry editor: HKEY_LOCAL_MACHINE\SOFTWARE\ASIO.
If you get an error from the terminal which looks like:
The program 'ossia-score' received an X Window System error. This probably reflects a bug in the program. The error was 'BadMatch (invalid parameter attributes)'. (Details: serial 363 error_code 8 request_code 154 minor_code 34) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the --sync command line option to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.)
Then this is likely an OpenGL driver issue. Try running score with the
--no-opengl command-line flag.
Most of the time, this is due to incorrect sound settings.
Go to the settings and check that you have a valid sound card set.
Most of the time, this is due to incorrect sound settings. Check that you are not using the Dummy driver which does not uses the soundcard.
Go to the settings and check that the correct sound-card is selected for audio output (for instance, it happens that the sound card chosen is the HDMI output of the computer monitor, which may not have loudspeakers).
This is due to a PortAudio bug.
Use the JACK backend instead.
You are likely encountering security-related macOS issues.
As a workaround, you can follow the steps given in the above link to remove the code signing of the score binary, which will in turn make macOS allow score to open virtual webcams and any audio plug-ins.
You are likely encountering this macOS issue.
As a workaround, you can try to open score by right-clicking on Score.app, selection “Open contents”, navigating to “Score.app/Contents/MacOS” and running the “score” binary from there.