To reproduce:

1. Open the project, attached by tester
2. Select Main Camera in the scene
3. In the Inspector, change values in the New Behaviour Script

Expected: changing values in the Inspector does not crash the Editor when using StructLayout attribute
Actual: when the StructLayout attribute is used and two fields are initialized at the same position in memory, changing values in the inspector crashes the Editor

Reproduce in 5.3.8f1, 5.6.5p1, 5.5.3p1, 5.6.0p2, 2017.1.0b1

By design: Arrays in C# are dynamically allocated, and by having the memory layout as such that an array pointer overlaps with another property will cause a
crash, even in regular C# code.