This is a bug Apple introduced in macOS 26.1. We are currently preparing a hot-fix with a workaround for this issue. A possible other solution is to downgrade to macOS 26.0.1.
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Thank you @Arne_Scheffler
Hi,
Cubase 15.0.6 hotfix is out. This issue has been resolved in this hotfix update.
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Tested it and it works better now. 
I did a very quick test though and although I thought for a second that MassiveX which I’d had opened randomly was getting jittery, it did not cause any more trouble after opening it a second time (could be an NI issue, not a Steinberg issue).
Will keep an eye on it and update any findings.
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I am still experiencing stuttering at times, especially when a plugin window is open, like Arturia “REV INTENSITY” and a channel window. Then when you click the timeline and the channel window gets hidden, the choppiness returns. Video:
Steps to reproduce:
- Open a Plugin UI
- Open Channel window, place next to each other
- Click on the Timeline window (which hides channel window)
So MacOS 26.2 just dropped and it contains virtually no real bugfix at all. That GPU buffer issue is going to plague us for 6 more months isn’t it?
Had the UI freezing and based on reading this thread I disabled GPU Acceleration.
Instantly solved the problem.
MacBook M1 Ultra Tahoe 26.1.
Cubase 12 pro.