Why on earth would you use X2 when you have Platinum... X2 was full of bugs. They sorted it out at X3e.
I've never seen anyone else complain about Rapture crashing Sonar so this is all weirdness.  
I've never used Rapture so it would be no loss to me if It didn't work. 

X2 crashed again. Platinum is still fine. Still trying to pinpoint the trouble.

If crashes are with blue screen, that is NOT Sonar nor plug-in crashing. That is some driver, probably audio driver. Check settings there, check if the driver is the latest. CW has modifies things between X2 and Platinum, so it can happened that Platinum is not inducting the driver crash while X2 does.

Is your Windows maintenance and your audio driver and system drivers maintenance up to date?
 
If not, that could cause some issues for any of the applications installed, but certainly for X2.
 
What are you doing in X2 when it crashes?  
 
Are you just launching X2 and it dies before you even get to loading a project?  
 
And, what happens if you open Sonar in its Safe Mode?  (Hold Shift down when launching Sonar).  Does it die then?
 
And lastly, like others ahead of me in the thread, why on Earth would you still want to use X2, when Platinum is SOOOOO much more advanced, as well as more stable?  (just curious - X2 should be able to be opened and used if you want to do so, but even so, Platinum is WAY better than X2, for lots and lots of reasons).
 
Bob Bone
 

This is a new laptop, so I'm still getting things set up. I do get a sign about the interface, so I need to make sure that driver is current.
 
The crashes are sporadic. I'll open X2 and leave it open and sooner or later I will get the blue screen and it says it's collecting data and when it reaches 100% is shuts off and re-opens.
DS

No surprise, that's exactly what to expect from X2. This forum was post after post about crashes back then. I stayed with 8.5 until X3 came out and the complaints diminished to a dull roar.  Forget it. Use Plat. 

Uninstall all your Sonars. Clear the registry of all entries. Reinstall X2 first with all updates, then Plat. Do full installs for both. I have seen where one version install affects another in ways that are unexplainable.

I checked, and Platinum recognizes my little Focusrite 2i2, but X2 does not. I can't understand why Platinum sees it but X2 doesn't. I've added the Focusrite and it shows up in the Devices and Printers window, but I can't find a way to make X2 see it.

That's the latest.
DS