# Segmentations not drawing on volume

**URL:** <https://discourse.slicer.org/t/segmentations-not-drawing-on-volume/2106>\
**Category:** Support\
**Created:** [February 18, 2018, 12:29pm UTC](https://discourse.slicer.org/t/segmentations-not-drawing-on-volume/2106 "2018-02-18T12:29:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![drusmanbashir](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/drusmanbashir/32/1282_2.png) [@drusmanbashir](https://discourse.slicer.org/u/drusmanbashir)\
**Post date:** [February 18, 2018, 12:29pm UTC](https://discourse.slicer.org/t/segmentations-not-drawing-on-volume/2106/1 "2018-02-18T12:29:42Z")

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At random, when i try to edit a newly created segmentation with the paint or draw effect, the segmentation map does not update at all. The error log shows:

Input port 0 of algorithm vtkImageMapToWindowLevelColors(000002564BEED4C0) has 0 connections but is not optional.

I usually have to restart slicer and then it works!

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<div class="post-metadata">

**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:** [February 18, 2018, 2:03pm UTC](https://discourse.slicer.org/t/segmentations-not-drawing-on-volume/2106/2 "2018-02-18T14:03:05Z")

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Can you send the complete application log? (menu: Help / Report a bug)