[MAC] Blender crashing after a certain amount of objects in a scene

Hello everyone, so basically I am working on a animation, just a simple little minecraft one, but it keeps crashing.

It has nothing to do with how many verts on screen etc, I go into bounding box mode all of the simplest modes and it still crashes. So right now when I add in two more objects into the scene it just crashes. It used to be three but then I added in one and saved it.


iMac OS X Version 10.9.2
Processor : 2.5 GHz Intel Core i5
Memory : 4 GB 1333 MHz DDR3M
GRAPHICS : AMD Radeon HD 6750M 512 MB

And it has plenty of storage.

Any help?