# Mac preview release fails to load extensions in the Extension Manager

**URL:** <https://discourse.slicer.org/t/mac-preview-release-fails-to-load-extensions-in-the-extension-manager/46612>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [March 30, 2026, 2:25pm UTC](https://discourse.slicer.org/t/mac-preview-release-fails-to-load-extensions-in-the-extension-manager/46612 "2026-03-30T14:25:56Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![DeepaKrishnaswamy](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/deepakrishnaswamy/32/8913_2.png) [@DeepaKrishnaswamy](https://discourse.slicer.org/u/DeepaKrishnaswamy)\
**Post date:** [March 30, 2026, 2:25pm UTC](https://discourse.slicer.org/t/mac-preview-release-fails-to-load-extensions-in-the-extension-manager/46612/1 "2026-03-30T14:25:56Z")

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Hi,

I installed the latest Slicer Preview Release 2026-03-29 (Slicer 5.11.0 revision 34472) on Mac. I noticed that the extensions are not loading in the Extensions Manager:

 ![Screenshot 2026-03-30 at 10.24.34 AM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/e/fe7fa605345d83456b24fba2d0b65bda54632fdd.png)

I checked cdash and noticed many errors, even for extensions that should work like SlicerRT.

Thanks!

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