Unexpected Quit Error in Cubase Pro 8 in Yosemite

[WallyV]

@RichStudio

When I originally installed Cubase 8 Pro in Yosemite, everything was working perfectly.
Had a medium sized project going with no issues.
Then, Bam! Stopped opening up.
I deleted all preferences, programs etc and did a complete reinstall.
Still no dice.
Thank goodness I have Windows 7 (via Bootcamp) on the system so I am finishing using the OS X version.

Regarding the Safe Start recommendation:

Safe-start Mode: How?

C8.0.5 is running like a champ on a 2012 Mac Mini and a 2010 Macbook Pro, both with 10.10.1
What year Mac model are you using? How much RAM? Third party plug-ins?