Why does the engine crash when adding to an array ?

Yeah. Have uploaded it to google drive. Its a different version too. I added some comments and polished some others.
Please check the attached readme for crash repro steps.
PS: Just discovered a third scenario: Just add some staff members and do nothing. Crash will occur after a minute or so.
All three crashes produce different error messages.

Note that the code design is still very crude and highly WIP, but before I do some refactoring and reorganization, I’d like to get this issue understood/fixed…

https://drive.google.com/file/d/0B8K5b8-u_ENTMERScU1IbHowUGs/view?usp=sharing

That would mean the full source code of about a dozen classes and approx 30 to 40 blueprint screenshots of all functions and bindings.
Im not sure that would make much sense.