The 4.14.2 release fixed some cases of this crash, but we are aware that other cases are still occurring. For ongoing crashes, a new ticket has been logged: https://issues.unrealengine.com/issue/UE-40824. This ticket is marked as "Fixed" because the specific reproduction case has been resolved. Epic is still investigating other causes of this crash.
Most recent user affected CL:
CrashReporter User Descriptions:
Materials get assigned correctly
This bug only occurs on certain hardware. I will attach the dxdiag of the computer used to reproduce this crash with these steps named "ReproDxDiag".
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-38818 in the post.