# TotalSegmentator finishes successfully but Slicer GUI freezes on macOS (M2-Pro Sequoia) after completion

**URL:** <https://discourse.slicer.org/t/totalsegmentator-finishes-successfully-but-slicer-gui-freezes-on-macos-m2-pro-sequoia-after-completion/45753>\
**Category:** Support\
**Tags:** totalsegmentator\
**Created:** [January 12, 2026, 4:37pm UTC](https://discourse.slicer.org/t/totalsegmentator-finishes-successfully-but-slicer-gui-freezes-on-macos-m2-pro-sequoia-after-completion/45753 "2026-01-12T16:37:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Lennart99](https://avatars.discourse-cdn.com/v4/letter/l/e495f1/32.png) [@Lennart99](https://discourse.slicer.org/u/Lennart99)\
**Post date:** [January 12, 2026, 4:37pm UTC](https://discourse.slicer.org/t/totalsegmentator-finishes-successfully-but-slicer-gui-freezes-on-macos-m2-pro-sequoia-after-completion/45753/1 "2026-01-12T16:37:26Z")

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Hi everyone,

I am using the TotalSegmentator extension in slicer to segment MRI data. The data is successfully loaded and apparently segmented, however, before loading the segments into slicer and making them accessible, Slicer freezes after the “saving segmentations“ log. I have tried running it in the fast and normal mode, both result in the same outcome. Slicer must then be force-quit. I am using an M2 Pro. Has anyone here experienced something similar and was able to solve the issue?

Any help would be greatly appreciated.

Thanks a lot!

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [January 12, 2026, 4:39pm UTC](https://discourse.slicer.org/t/totalsegmentator-finishes-successfully-but-slicer-gui-freezes-on-macos-m2-pro-sequoia-after-completion/45753/2 "2026-01-12T16:39:53Z")

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Does it help if you wait a long time (e.g., 1 hour)?  
Can you show a screenshot of the log window?

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<div class="post-metadata">

**Author:** ![Lennart99](https://avatars.discourse-cdn.com/v4/letter/l/e495f1/32.png) [@Lennart99](https://discourse.slicer.org/u/Lennart99)\
**Post date:** [January 12, 2026, 6:46pm UTC](https://discourse.slicer.org/t/totalsegmentator-finishes-successfully-but-slicer-gui-freezes-on-macos-m2-pro-sequoia-after-completion/45753/3 "2026-01-12T18:46:24Z")

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Thank you for looking at the issue.

unfortunately waiting for a long time won’t help. I am currently running TotalSegmentator from the terminal and importing the NIFTI files to Slicer manually. It does work fairly well, but is manual another step.  
The log window basically shows exactly the same as the console of the terminal. I have attached the screenshot. At the point

…“Saving segmentations…

Saved in 18.84s“…

3D Slicer freezes.

 ![Bildschirmfoto 2026-01-12 um 19.38.48](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/d/0d64d3f2a84758c622e68426f94cf94952210353.png)