It seems to be only happening with one particular project, but I'd like someone else to try this & confirm (or not) whether it's 
happening elsewhere.
 
 
Simply try inserting 2 instances of Rapture (64 bit) and add any sort of midi data you want
 
When you've done that, what happens if you switch screensets?
 
Like I said, this immediately results in a "SONARPDR.exe has stopped working" message and I crash back to the desktop
 
 
 
Thanks

X3c?

Hi Jonesey,
Seems to work OK here...two instances of Rapture, some MIDI data on their tracks and switching through screensets without a problem.
 
Win 8.1 x64, Sonar 64-bit X3c, 64 bit engine on.
 
Ya know, I seem to recall occasionally having problems after updating with projects or templates that were created in older versions. Did this problem creep up after updating? If so, does it persist when you create a new project from scratch?
 
Dean

This is definitely only happening with older projects opened in X3c
 
I will try a new project later and see if anything weird happens
 
Thanks for checking

Hi, Colin
 
I just tried this in a new project, and in an old one started in X2a, andit was fine.
 
Are you using SITs or separate audio and MIDI?
 
Anything else that you can think of that I might have missed?

I always use split Midi/Audio
 
And no, I can't think of anything different about this project compared to others

I thought you did. I'll have another go shortly.

Hmm.  No luck reproducing it here.  I've tried a few alternatives, but still no crash.
 
Is it just on one project, or on any older project?  Did you try it on a new project?  I'll keep thinking..