I Love Cubase but for its constant crashing on startup

So…as the title states (I’m a former sonar user)

I find that many 3rd party plugins cause Cubase to hang on startup.
Before closing my project I have to:
Disable PLAY
Disable QL Spaces
Disable VSL Ensemble

and even then it occasionally hangs on startup. But as long as I remember to disable the above I’m usually OK.
Is this really an issue with the above plugins?

Windows 7 64, cubase 8.5