Issue - Cubase 15 crashes instantly when opening Score Editor on Intel iMac running macOS Sequoia 15

Cubase
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“Cubase 15 crashes instantly when opening Score Editor on Intel iMac running macOS Sequoia 15.7.3.
Same system runs Cubase 14 Score Editor without issue.
Brand-new project with simple MIDI notes reproduces the crash.”

regressions between major versions

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Hi @Garry_Norman, welcome to the forum. Sorry to hear you’re having problems. This isn’t expected at all, and we haven’t had reports of the Score Editor always crashing. Could you clarify the steps you’re taking, and point out exactly at which point the crash occurs? It appears this happens with any project, new or existing?

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This was my diagnostic path, guided by Cubase ChatGPT - Crash happens with all ways the Score Editor can be invoked, both with new project and old projects.### Cubase 15 Score Editor is broken on:- Intel Macs

  • macOS Sequoia (15.x)

  • AMD GPUs (2019 i

Why?

  • The Score Editor is pre-Dorico legacy code

  • It uses deprecated CoreGraphics text layout paths

  • Sequoia removed / hardened several fallback drawing APIs

  • Apple Silicon survives because it uses newer Metal-backed paths

  • Intel does not

Once Sequoia loads, the Score engine fails at startup, not during use

## Important: why NOTHING fixes it on Sequoia (Intel)

Fix | Why it fails |

  • | - |
    Preferences reset | crash is below prefs layer |
    Clean project | crash is not MIDI-related |
    Font cleanup | crash happens before font load |
    Disable GPU | Score Editor still initializes graphics |
    Terminal DPI overrides | Sequoia ignores legacy flags |
    Separate window | crash happens before window creation |

Cubase 15 crashes instantly when opening Score Editor on Intel iMac running macOS Sequoia 15.7.3.

Same system runs Cubase 14 Score Editor without issue.
Brand-new project with simple MIDI notes reproduces the crash.”

This matters — regressions between major versions
4

Hi, I have no dog in this particular hunt but I would strongly recommend removing personal contact information from your post on a public forum.

1 Like
5

Unfortunately this analysis is totally meaningless. In order to diagnose further you will need to attach a crash dump .