The HillTree_02 mesh from the Open World Demo collection has a shader compile error.
The user pointing the issue out is reporting a freeze whenever he attempts to use the asset. I provided a workaround by converting the constant vectors to 3vectors, which resolved the compile issue.
I believe the freezing is due to the users amount of RAM, but upon initial load the asset does take a fair amount of time to load into memory. Also something interesting to note, which I have highlighted in the screenshots. It does not appear the mesh in question has a valid Source File location. All the other assets from this sample do have a Source File. Perhaps this could be causing some issues as well.
1. Create new project and add the Open World Demo Collection content to your project.
2. Open the HillTree_02 mesh.
3. Open the M_CustomDepthBillboard parent material.
Outcome There is a compile error "MaterialEditorStats:Error: Error [SM5] (Node TransformPosition) input must be a vector"
Expected The material compiles with no error and renders as expected.
Head over to the existing AnswerHub thread and let us know what's up.