This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
As stated in the linked UDN ticket, these particle modules are missing their InitializeDefaults code:
ParticleModuleMeshRotation ParticleModuleMeshRotationRate ParticleModuleMeshRotationRateMultiplyLife ParticleModuleMeshRotationRateOverLife ParticleModuleSourceMovement ParticleModuleVectorFieldScale ParticleModuleVectorFieldScaleOverLife
When a distribution is reset to default via the corresponding button in the UI, it is now reset to None, which will lead to a crash with cooked content.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-18775 in the post.
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| Component | UE - Graphics Features |
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| Created | Jul 16, 2015 |
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| Resolved | Feb 15, 2017 |
| Updated | Apr 27, 2018 |