Fatal Error 'core_box.dae

[Romulator]

Amnesia itself is not fully compatiable with Mavericks. Therefore I would not expect the Dev tools to be just as functional.

There is a patch on the way however, once a means to resolve the issue is found. I will assume that this same patch will correct errors in the Level Editor, and though may not download at the same time, will be made available once stable.