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Mesh Deform Modifier Missing / not visible
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System Information
Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: Radeon RX 570 Series ATI Technologies Inc. 4.5.13492 Core Profile Context 22.19.676.4

Blender Version
Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: rB5be9ef417703
Worked: (newest version of Blender that worked as expected)

Short description of error
[Please fill out a short description of the error here]
Mesh Modifier is fine, but is not visible in the stack when adding modifiers.

Modifier becomes visible once I move any others, but disappears once again after rearranging the modifiers within the Stack.

This only seems to affect the Mesh Deform Modifier(s).

The Mesh Deform Modifier that is visible cannot be edited, only deleted, unless the other Mesh Deform Modifier -- or any other Modifier -- is deleted first.

Exact steps for others to reproduce the error

Add a Mesh -- preferably a Sphere --

Make two Mesh Deform Modifiers and apply both to the mesh.

Add following Modifiers in following order:

Armature modifier,

Corrective smooth modifier,


Two Mesh Deform Modifiers

[Please describe the exact steps needed to reproduce the issue]

Event Timeline

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Needs Information from User.Mar 1 2021, 3:45 PM

Please share your example .blender file (this ensures we are all on the same page).

This comment was removed by Tettey Nartey (Tettey).

The File should be available in this upload right now. I will upload here again as comment in case it is not there

Philipp Oeser (lichtwerk) changed the task status from Needs Information from User to Needs Triage.Mar 2 2021, 10:13 AM

This might be a duplicate of T86101.

I am getting these errors in the console: Error, region type 5 missing in - name:"Action", id:12.

In master, the file also seems to leak memory Error: Not freed memory blocks: 2, total unfreed memory 0.000061 MB.

Falk David (filedescriptor) changed the task status from Needs Triage to Confirmed.Mar 2 2021, 12:52 PM

This seems to be the same as T85223: Modifiers disappear when you have multiples of them (opening old files), will merge the reports lets continue discussion there, will update T85223 wilt the file provided here.