System Information
Operating system and graphics card

Blender Version
Broken: 2.70 RC2
Worked: (optional)
iMac 3.4 GHz, AMD Radeon HD 6970M card 4GB Ram DDR3 Snow Leopard 10.6.8
Short description of error

Open Blender 2.70 RC2.
Hit Z key - crashes Blender. Does not do this in 2.69

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Open Blender 2.70 RC2.
Hit Z key - crashes Blender.