# cannot see 3D viewer and segmentation apply button not working.

**URL:** <https://discourse.slicer.org/t/cannot-see-3d-viewer-and-segmentation-apply-button-not-working/17068>\
**Category:** Support\
**Created:** [April 13, 2021, 4:49pm UTC](https://discourse.slicer.org/t/cannot-see-3d-viewer-and-segmentation-apply-button-not-working/17068 "2021-04-13T16:49:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![srraju](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@srraju](https://discourse.slicer.org/u/srraju)\
**Post date:** [April 13, 2021, 4:49pm UTC](https://discourse.slicer.org/t/cannot-see-3d-viewer-and-segmentation-apply-button-not-working/17068/1 "2021-04-13T16:49:20Z")

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Problem report for Slicer 4.11.20210226 win-amd64: [please describe expected and actual behavior]

1. cannot see the 3D rendered image in the viewer. I tried changing from CPU to GPU and to CPU. Also centered the image by clicking on Center button. Also the eye button and show button were clicked on.

2. The Apply button for segmentation isn’t working. no matter how many times i click on it the selection keeps blinking.

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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:** [April 13, 2021, 5:11pm UTC](https://discourse.slicer.org/t/cannot-see-3d-viewer-and-segmentation-apply-button-not-working/17068/2 "2021-04-13T17:11:17Z")

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Is this something you can replicate with sample data?

Also have a look in the error logs:

[https://slicer.readthedocs.io/en/latest/user\_guide/get\_help.html?highlight=error](https://slicer.readthedocs.io/en/latest/user_guide/get_help.html?highlight=error)

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**Author:** ![srraju](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@srraju](https://discourse.slicer.org/u/srraju)\
**Post date:** [April 13, 2021, 9:09pm UTC](https://discourse.slicer.org/t/cannot-see-3d-viewer-and-segmentation-apply-button-not-working/17068/3 "2021-04-13T21:09:10Z")

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Thanks Pieper. From the log book it said lack of memory. I closed other windows and it worked.