# This is popping up

**URL:** <https://forums.steinberg.net/t/this-is-popping-up/1019313>\
**Category:** Cubase\
**Tags:** cubase-15\
**Created:** [December 29, 2025, 1:42pm UTC](https://forums.steinberg.net/t/this-is-popping-up/1019313 "2025-12-29T13:42:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Alan-Russell](https://avatars.discourse-cdn.com/v4/letter/a/b487fb/32.png) [@Alan-Russell](https://forums.steinberg.net/u/Alan-Russell)\
**Post date:** [December 29, 2025, 1:42pm UTC](https://forums.steinberg.net/t/this-is-popping-up/1019313/1 "2025-12-29T13:42:22Z")

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Cubase 15 Pro latest update What is this?

 ![Screenshot 2025-12-13 115750](https://europe1.discourse-cdn.com/steinberg/original/4X/c/7/7/c77957236df3dce4bd054af7964108c91a29679a.png)

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**Author:** ![fese](https://dub1.discourse-cdn.com/steinberg/user_avatar/forums.steinberg.net/fese/32/121132_2.png) [@fese](https://forums.steinberg.net/u/fese)\
**Post date:** [December 29, 2025, 1:53pm UTC](https://forums.steinberg.net/t/this-is-popping-up/1019313/2 "2025-12-29T13:53:11Z")

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> **[Error message on Windows: MMCSS priority cannot be set!](https://helpcenter.steinberg.de/hc/en-us/articles/13338094735762-Error-message-on-Windows-MMCSS-priority-cannot-be-set)**
>
> Problem
> The following error message appears while running Cubase/Nuendo.Additionally, audio dropouts may occur.
> ⚠️ MMCSS priority can not be set!
> Background
> Cubase and Nuendo support two APIs (Appl...

And this thread

> [@Cubase 13 - "MMCSS priority cannot be set!"](https://forums.steinberg.net/t/cubase-13-mmcss-priority-cannot-be-set/877242/9):
>
> Thank you for the link. Will setting the threads to 64 have any negative impact on the CPU, such as increased CPU usage? Can you elaborate on what exactly will happen as a result of making this alteration? I use a Ryzen 7900X, and throughout the entire cycle with Cubase 12, I never encountered these errors; it worked flawlessly. Big projects, hundreds of MIDI tracks, no crashes, no audio dropouts. Now with Cubase 13 and the exact same computer specs and projects, I’m suddenly bombarded with the…