Movie materials disappear with 4.12 standalone preview and in packaged project

Hey Jeremy,

I was able to reproduce the issue with the content and information you provided. Thank you for clarifying the issue and providing a reproducible case. I have entered a bug, UE-31715, for this issue. Once the bug has been addressed by the developers a fix will be made and integrated into an upcoming full engine release or hotfix, and then added to the list of fixed issues.

Let me know if you have further questions or need additional assistance.

Cheers,