# CTH Filter Bug in 5.6 (worked in 5.5)

**URL:** https://discourse.paraview.org/t/cth-filter-bug-in-5-6-worked-in-5-5/1483
**Category:** ParaView Support
**Created:** [March 18, 2019, 8:26am UTC](https://discourse.paraview.org/t/cth-filter-bug-in-5-6-worked-in-5-5/1483 "2019-03-18T08:26:22Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Dave](https://discourse.paraview.org/user_avatar/discourse.paraview.org/dave/32/446_2.png) [@Dave](https://discourse.paraview.org/u/Dave)
#### Post date: [March 18, 2019, 8:26am UTC](https://discourse.paraview.org/t/cth-filter-bug-in-5-6-worked-in-5-5/1483/1 "2019-03-18T08:26:22Z")

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We have updated Paraview to 5.6 and when I try the ‘Extract CTH Parts filter’, it completes the operation without any errors, but no materials appear on the screen. The mesh array is still displayed, however.

If I then do a fragment analysis by using the ‘Extract CTH Model Interfaces’ filter, this works perfectly and, hey presto, the material appears.

I think that this is a bug in 5.6, because this worked fine in 5.5.

Cheers,  
Dave

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### Author: ![cory.quammen](https://discourse.paraview.org/user_avatar/discourse.paraview.org/cory.quammen/32/11193_2.png) [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [March 18, 2019, 3:23pm UTC](https://discourse.paraview.org/t/cth-filter-bug-in-5-6-worked-in-5-5/1483/2 "2019-03-18T15:23:41Z")

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Hi Dave,

Could you file this bug at [https://gitlab.kitware.com/paraview/paraview/issues](https://gitlab.kitware.com/paraview/paraview/issues)? Please include step by step directions to reproduce the problem you see.

Thanks,  
Cory