When I add a Rapture Session 64-bit VST3 synth to my project, SONAR crashes immediately when I open the "Synth Property Page". This crash occurs when I add a synth to a project and check the "Synth Property Page" in the "Open These Windows" group on the "Insert Soft Synth Options" window.
 
If I do not check the "Synth Property Page" option as described above, the soft synth will be added to the project successfully. However, as soon as I try to open the properties window to select an instrument, the crash occurs.
It is worth noting that I also have a Garritan Aria Player 64-bit VST2 plugin configured. I don't have any issues with adding this soft synth and using its properties page. I have tried removing this plugin from the configuration and still experience the Rapture Session defect.
 
I have installed SONAR Artist and Rapture Session on my laptop; also Windows 10 Pro 64-bit. I do not experience the same problem there. I am able to successfully add soft synths on that environment. So, this appears to be a localized problem.
 
I suspect that this issue has more to do with the plugin than it does SONAR, but I'm not certain.
 
Any input/suggestions this community can provide would be very appreciated.
 
Thanks, Brian

I saw the post over in Cakewalk instruments. This post is in the right place. Moving it to Cakewalk Instruments would not gain anything other than it will hang around on the first page longer.
 
Crash could mean a lot of things and rarely happens without a message or log entry somewhere. Maybe providing a better description of the crash would help.

I wasn't certain if I had put this post in the right forum.  Thanks for cancelling the Instruments post.
 
I reported this issue to Cakewalk support on 5/19 but haven't gotten any response.  Understand they're swamped at the moment.
 
As soon as I attempt to open the synth properties page, the Fault Reporter asserts itself and tells me that a fault has occurred.  It asks if I'd like to submit a fault report.  I've done this a few times.  Oddly, since I updated to the 2016.06 release, the Fault Reporter is no longer working.
 
Once moving past the fault report, SONAR crashes.  I've tried adding an image of the Unhandled Exception window to this post but it doesn't appear to be working.  In brief, the "Error - Unhandled Exception" window says:
 
----
A fatal error has occurred in plugin 'Rapture Session.'
Module: c:\program files\common files\vst3\Rapture Session\RaptureSession_64.vst3
 
A crash dump file base been created here: ...
 
Exception Code: c0000005
Address: ...
 
As a result of this error SONAR is about to exit abnormally.
Should SONAR attempt to save a recovery copy of your work?
----
 
I can fill in the rest of the detail if that helps.
 
Thanks, Brian

Do you have a CWBRN from the initial report?
What driver mode are you using?

Weird tha a plugin issue could be caused by driver mode!

Maybe you can be of assistance? I have not seen this reported before. How would you proceed to help this user?

First report I sent was CWBRN-51195.
 
I've seen driver modes mentioned a fair amount on these posts.  I am new to Cakewalk products but I think this means the Driver Mode under the Playback and Recording preferences.  If this is the correct setting, my current mode is set to MME (32-bit).  Worth noting that I think this was the default when I set up SONAR.  I did not consciously / intentionally change this setting.
 

You are correct, MME is the default for your machine. And while others have mentioned it is unlikely to be the issue were it set to something else it might have contributed to your problem.

Have you tried reinstalling the plug-in? If so, was it by clicking the Reinstall button in the Command Center, by uninstalling, cleaning the registry and reinstalling or some other method?

BTW, does the stand alone version work?