That's complicated sounding enough that it just might work! 

Huh, I use these all the time and never had an issue.  I typically use the SI instruments as simple instrument tracks.

CedricM
Either Insert / Soft Synth / VST2 / The Soft Synth or from the browser
 
Options:
Create these tracks:
X Simple instrument track
Enable midi output: Unchecked
 

Does the problem occur when you don't use simple instrument tracks, but "normal" separate MIDI and audio tracks?

Hey,
 
No time so far, I'll give a try tomorrow to the Do not intercept NRPNs tomorrow.

So:
- The imported midi files only have notes. I have checked them one by one with the event viewer.
 
- I have updated to the latest version of Sonar Platinum Everest Update 1. Something is very wrong:
 
A. I can't open one of my test files without Sonar crashing on me. At the very least, with the previous version it did not crash.
 
B. The interaction Roland Quad Capture - Sonar Platinum goes from bad to worse, with Sonar sometimes complaining about non supported bit depth/rate. When it crashes it crashes so bad the Capture is nowhere to be found anymore in Sonar. The only way to bring it back is to close Sonar, remove the usb cable, replug the Capture interface, start Sonar.
 
C. Starting Sonar and loading the crashing file with the shift key pushed, I am asked whether I want to load the plugins / the instruments one by one. When I say yes each time, everything loads fine and the project does not crash !
It looks as if the newest version of Sonar is trying to read things too quickly and crashes by not waiting the full initialization of a plugin.
 
- I will now try again to do a test from scratch with the virtual instruments to see if the problem is still there or not.
 

I'm very confused.
 
Scook you were right there were data before and after the notes in all the midi files I imported.
I really don't know how I could have not seen them while using the event list on all tracks the first time, and why I did see them while reimporting in a new Cakewalk project.
 
I stopped at seven, but I did not have problems with Vstis this time. I will have to check at 2 possible causes for the problems when I have time: A. perhaps it was linked to problems I suddenly have with my Quad Capture (which I really don't understand). B. perhaps Synthogy pianos is leaking memory or something (didn't use it this time, used EW Pianos Platinum instead). Or C it could be that the latest update improved the situation.
 
So now I'm with 2 new problems that may not have anything to do with VSTIs.
- Problems with Quad Capture and Sonar (no problems with other DAWs). I will create a new thread sometimes for this issue, or contact the technical support.
- Minor problem with editing events in events list: the shift key does not work as it should to select a range of events, I had to crtl select all the events I wanted to delete.
 
But as long as I do not have more problems with VSTIs, I consider this thread solved.
Thanks guys for the help.
 

Regarding the quad capture it might be worth renaming Sonar's aud.ini file and allowing Sonar to create a new one from scratch. That can sometimes solve all kinds of issues.

Another thing to try is uninstalling the drivers, rebooting then installing the drivers again.