UDN users have reported hangs in the material editor when editing specifi material instances. This seems to be a threading bug, as CompileDebugViewModeShaders()  is waiting for a shader compilation to complete which does not happen.

Attached is a sample project from a UDN user with MIs triggering this behaviour.

Link to UDN case: [Link Removed]

Steps to Reproduce
  1. Open attached project sample.
  2. Open a MaterialInstance in the sample.
  3. Edit a static parameter and save.

Observe the editor freezes. This does not always occur.

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Affects Versions5.3.1
Target Fix5.4
Fix Commit29556245
Main Commit29556245
CreatedNov 2, 2023
ResolvedNov 8, 2023
UpdatedDec 1, 2023