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Dynamic Material Instance Parameter not applied on Play.

In my blueprint construction script, I'm creating a dynamic material instance from my particle system. The particle system only has a single emitter, so index 0 is used. I have a material expression scalar parameter exposed from the material that I'm editing via BP. alt text

This works as expected in the editor. Changing the Emissive parameter modifies the material. However, when I hit play, the value set via BP is not applied to the material. While playing, I can select the BP and see that it still contains the correct Emissive value and if I modify this value it will suddenly kick in and work.

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asked Nov 27 '14 at 12:12 AM in Rendering

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