Any luck with this one? I'm having the same problem. I've tried others' recommendations to touch ../Extensions, and this completely horks the VM. Fortunately I can restore from a "known good" spot. Specs: OS X 10.10 Yosemite-Zone AMD FX-8150 X325BV-FMDR (1920x1080@60Hz) 1023MB NVIDIA GeForce GTX 560 Ti (MSI) ASUSTeK COMPUTER INC. M5A99X EVO (Socket 942) So, how does the VM go from running on instant, last time my host machine was running, to not booting the next time the host machine is running?