Blendfiles turn White. Why?

I run on iMac 10.9.2 64 bits mid 2011 and Blender 2.69 64 bits.

All my blend files have become white. Both old and new once.
I talked to Apple Support, but they blame Blender to be the cause. Do you know why my blend files turn white. A old blend file B new blend file. Tell me.

Apple support solved my problem. Restarted my iMac with Cmd+R down.