# ROI editor 'Fill tool stopped working 

**URL:** https://community.mrtrix.org/t/roi-editor-fill-tool-stopped-working/8861
**Category:** Uncategorized
**Created:** [October 10, 2026, 7:46am UTC](https://community.mrtrix.org/t/roi-editor-fill-tool-stopped-working/8861 "2026-10-10T07:46:37Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![cris\_schaurich](https://community.mrtrix.org/user_avatar/community.mrtrix.org/cris_schaurich/32/5169_2.png) [@cris\_schaurich](https://community.mrtrix.org/u/cris_schaurich)
#### Post date: [October 10, 2026, 7:46am UTC](https://community.mrtrix.org/t/roi-editor-fill-tool-stopped-working/8861/1 "2026-10-10T07:46:37Z")

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Hi all, the 'Fill tool suddenly stopped working. All the other features are working well on ROI editor. Do you have any recommendation to tackle that?

Thank you!

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### Author: ![bjeurissen](https://community.mrtrix.org/user_avatar/community.mrtrix.org/bjeurissen/32/28_2.png) [@bjeurissen](https://community.mrtrix.org/u/bjeurissen)
#### Post date: [October 10, 2026, 8:19am UTC](https://community.mrtrix.org/t/roi-editor-fill-tool-stopped-working/8861/2 "2026-10-10T08:19:30Z")

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I can reproduce this issue with MRtrix 3.0.8 on macOS 27.0.1 (26A434).

What MRtrix version are you using?

What OS are you using? And what version?

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<div class="post-metadata">

### Author: ![bjeurissen](https://community.mrtrix.org/user_avatar/community.mrtrix.org/bjeurissen/32/28_2.png) [@bjeurissen](https://community.mrtrix.org/u/bjeurissen)
#### Post date: [October 10, 2026, 3:21pm UTC](https://community.mrtrix.org/t/roi-editor-fill-tool-stopped-working/8861/3 "2026-10-10T15:21:10Z")

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Problem diagnosed and fixed in [mrview: Fix fill tool texture format in ROI editor by bjeurissen · Pull Request #3451 · MRtrix3/mrtrix3 · GitHub](https://github.com/MRtrix3/mrtrix3/pull/3451) . If you are comfortable building from source you can check out the `fix_roi_fill_format` branch and build to fix.