[Solved] Sonar Platinum - Scarlett 6i6 - Sound Forge 9 Not Playing Nice Together

I would like these three elements all to work on my computer with little or no tweaking from me: Sonar Platinum, Sound Forge 9, and system sounds (like internet streaming). I have made the Scarlett 6i6 the default device for audio and unchecked the "exclusive control of this device" box. So far (two days) I have only been able to get acceptable latency from the Scarlett by setting the sample rate to 96k, so that's what I have done. As it is right now, Sonar audio is working fine, and so are system sounds and streaming from SoundCloud, etc.
 
But Sound Forge won't play. It throws up this message: "Device sample rate could not be changed because the following applications are playing audio:" That's it. It doesn't name the offending applications. After clearing the first error message I get this second message: "An error occurred while starting playback. A device is not available." (Note: The title bar of both these messages references the Scarlett interface.) In Sound Forge Preferences|Audio the Scarlett is the selected playback and record device. When I open that dialog the sample rate is set at 44.1k, but when I close the dialog an error message says the same thing as when I first try to play a file, to wit "Device sample rate could not be changed because the following applications are playing audio:" When I reopen the dialog the sample rate has been changed (not by me) to 96k. Either way, Sound Forge will not play a file.
 
At this point, Scarlett Mix Control won't allow me to change the sample rate to 44.1k or anything else. Closing Sound Forge still won't allow me to change the sample rate. If I close Sound Forge and Sonar, then I can change the sample rate to 44.1k, reopen Sound Forge and play files. System sounds and streaming audio work, too. I can then reopen Sonar and that works, too, but  Sound Forge stops working with the same errors as before, only now it occasionally names the conflicting application as "audiodg."
 
So everything works, just not all at once. Can someone tell me what I can do to get everything playing nice together? I should note that for years I used a simple M-Audio Audiophile 2496 PCI card, set at 96k/24 bit, and everything worked without having to change settings between applications.
 
For those viewing on phones, my setup is: Sonar Platinum "E"/64 • Win7/64 • i7/2600 • 16GB RAM • Focusrite Scarlett 6i6 • NVIDIA GeForce 8400GS

The first application to latch onto an audio interface will lock it, so even if used by other applications they need to match. Check the sound card settings in Windows first, and set the preferred rate there. Windows should allow the sample rate to be changed by another program, but the first to get it "locks" it. From that point another program must have that sample rate set to use it. If using 96K, try setting both Windows and Sound Forge to 96K for defaults as well.