# How to debug vtkExodusIIReader for blocks appearing that should be hidden.

**URL:** https://discourse.paraview.org/t/how-to-debug-vtkexodusiireader-for-blocks-appearing-that-should-be-hidden/339
**Category:** Development
**Created:** [July 19, 2018, 2:11am UTC](https://discourse.paraview.org/t/how-to-debug-vtkexodusiireader-for-blocks-appearing-that-should-be-hidden/339 "2018-07-19T02:11:17Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [July 19, 2018, 2:11am UTC](https://discourse.paraview.org/t/how-to-debug-vtkexodusiireader-for-blocks-appearing-that-should-be-hidden/339/1 "2018-07-19T02:11:17Z")

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Hi guys,  
I’m trying to debug a problem on a dataset that I can’t pass out of Sandia. The issue is that with multiple files, when all blocks and sets are turned off, the blocks still appear.

Where is the point that the gui tells the reader whether to read sets and blocks? I assume this is in vtkExodusIIReader.cxx? Where should I place a breakpoint to see what is being returned from the gui?

Thanks,

Alan

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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: [August 27, 2018, 1:18pm UTC](https://discourse.paraview.org/t/how-to-debug-vtkexodusiireader-for-blocks-appearing-that-should-be-hidden/339/2 "2018-08-27T13:18:24Z")

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I wonder if [this merge request](https://gitlab.kitware.com/paraview/paraview/merge_requests/2676) fixed the issue you are seeing?

If not, try setting a breakpoint at line 635 of `paraview/VTK/IO/Exodus/vtkExodusIIReader.h` and see if that is hit. That line _should_ be called when a node set array is enabled or disabled.