This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below.
Most recent user affected CL: 3249277
Issue call stack shares some similarities with UE-24871
CrashReporter User Descriptions:
Crash after unchecking "Show engine content"
The engine content isn't shown on the drop down list of textures.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-40556 in the post.