[SOLVED] Midi no longer makes sound after stopping in the middle of playback

I can't make heads or tails of this one, but it's very consistent so hopefully I'm just missing something obvious... Using Sonar Platinum and Windows 10 here.
 
I made a new project that acts like it's breaking a connection somewhere between midi data and playback. When I open the file and hit play I can hear everything just fine. If I let it play until the end, I can stop and play it again just fine. But if I stop playback anywhere in the middle, there is no more sound to be had. When I hit play again I can see the lights going in the meters for the midi tracks, but nothing in the soft synth tracks or main output. No sound will play until I close and reopen the file. If I open up Kontact and try to click around on the keyboard I also get no sound there. The metronome, however, still makes noise.
 
Things I have tried (and which had zero effect):
* resetting midi and audio
* stopping the audio engine (why not try?)
* purging and reloading all samples
* increasing playback buffers
* updating to latest version of Sonar
* unchecking that pesky "allow applications to take exclusive control of this device" box in the properties manager for my audio interface
 
Other info that might be pertinent:
* This is not my first project in Sonar Platinum, but it is my first project on Windows 10.
* This is my first project with this sample library (LASS)
* Older projects do not seem to be affected
* I have a bunch of samples loaded but few in use so far
* I am nowhere near heavy CPU load, and my ram is about 50% (~9GB out of 16)
* Audio Interface = Roland Quad Capture
* East West's Play engine is loaded, as are multiple instances of Kontact and one of ENGINE
 
thank you very much for any help or thoughts you might have! 

Thank you thank you!

That has done the trick. I read up on that option in the documentation after seeing your post and it *seems* like the kind of thing that should have the opposite effect, but hey, it works. Maybe it has to do with how the library handles "zero".
 
And thank you for the welcome :) People here seem very kind.

Awesome that you got it worked out so soon after posting the issue. This is the best and most helpful forum I've ever been a part of. Just a note - You may want to edit the subject line of your post to reflect that your problem has been solved. You'll occasionally see a post with <SOLVED> in the header, something like that would be helpful to forum readers. Welcome to the forum!