ID 360158 - Instances of a static proxy mesh do not appear in the viewport.

Problem summary
Instances of a static proxy mesh do not appear in the viewport. Even with the Replicators>all option in the 3D Viewport properties enabled, the instances do not display.

Customer reported version
modo.12.1v2

Customer reported platform
10.13

Steps to reproduce
1) Open Modo.
2) Load the attached file or create the scene from "scene creation" below.
3) Select the "cube" item - this is the static proxy mesh.
4) Select the viewport settings icon in the top right of the viewport, then set "replicators" (under the "Drawing and Control" tab) to "all."
Result: The mesh instances are not displayed.

Scene creation:
1) Open Modo.
2) Hold "Ctrl" and click the cube tool to create a unit cube.
3) Select Geometry>Unit Primitives>In New Mesh>Plane.
4) Right click the mesh item containing the cube from step 2 and click "Covert to Proxy."
5) In the resulting popup, select a destination path.
6) Enable "Save as static mesh," then click "OK."
7) Select "Add Item" in the item bin and add a replicator (under "Particles").
8) In the Replicator settings, select the proxy mesh item as the prototype, and the plane as the point source.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:

15.0v1 - Windows 10

14.2v1 - Windows 10

14.1v1 - Windows 10

14.0v1 - Windows 10

13.0v1 - Windows 10

12.2v2 - Windows 10

12.1v1 - Windows 10, OSX 10.13.5 - Doesn't show the preview item on the replicator instances, but shows the preview item on the base mesh

12.0v1 - Windows 10, OSX 10.13.5 - Doesn't show the preview item on the replicator instances, but shows the preview item on the base mesh
11.2v3 - Windows 10 - Doesn't show the preview item on the replicator instances or the base mesh.
11.2v1 - Windows 10, OSX 10.13.5 - Doesn't show the preview item on the replicator instances or the base mesh.
11.1v1 - Windows 10 - Attached scene crashes on scene open, crashes the same scene is created from scratch after selecting the proxy mesh as the preview item.
11.0v3 - Windows 10 - Attached scene crashes on scene open, crashes the same scene is created from scratch after selecting the proxy mesh as the preview item.
10.2v4 - Windows 10, OSX 10.13.5 - Attached scene crashes when selecting "all" for replicators in the viewport preferences

Unable to reproduce bug in:
902 sp3 - Windows 10, OSX 10.13.5 - Attached scene displays the mesh items as expected.

Earliest version tested
902 sp3 - Windows 10, OSX 10.13.5 - This issue no longer appears in this version and has regressed

Expected behaviour
Mesh instances should appear when "Replicators" in the 3D Viewport settings is set to "all."

Actual behaviour
Mesh instances either do not appear or crash Modo when "Replicators" in the 3D Viewport settings is set to "all."