# a problem about flash back

**URL:** <https://discourse.slicer.org/t/a-problem-about-flash-back/19670>\
**Category:** Support\
**Created:** [September 14, 2021, 4:26pm UTC](https://discourse.slicer.org/t/a-problem-about-flash-back/19670 "2021-09-14T16:26:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![DoctorRen](https://avatars.discourse-cdn.com/v4/letter/d/f0a364/32.png) [@DoctorRen](https://discourse.slicer.org/u/DoctorRen)\
**Post date:** [September 14, 2021, 4:26pm UTC](https://discourse.slicer.org/t/a-problem-about-flash-back/19670/1 "2021-09-14T16:26:34Z")

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Operating system: Mac OS Big Sur  
Slicer version: slicer 4.11  
Expected behavior: solution to flash back  
Actual behavior: I can’t do anything when I import an external data, I click on any option in Slicer like Segement Editor and it flashes back, In addition, when selecting options such as Level tracing or Grow from Seeds during ROI delineation of DTI data, flash regression will also occur.

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [September 14, 2021, 5:04pm UTC](https://discourse.slicer.org/t/a-problem-about-flash-back/19670/2 "2021-09-14T17:04:55Z")

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It’s not clear to me what you mean by ‘flash regression’. Maybe you can make a screen recording to show the issue?