Hi Todd,
This sounds like a graphics driver problem. Do you ever see this error message when not using the Sonar Viewer? Does the Sonar Viewer then close after this crash/does the screen go blank or are you forced to close the Sonar Viewer yourself? I think this might be a tricky one to get to the bottom of, but it would be worth checking if your graphics card driver is up to date.
If you want to send me more details of your system, then please run the dxdiag application, save the output and send the file to This email address is being protected from spambots. You need JavaScript enabled to view it.
. There are some known issues with NVidia drivers after updating to W10 and this might have something to do with it.
To run dxdiag:
Press WINDOWS+R to get the Run command box, and type dxdiag, followed by return.
Once you've done this, click the "Save all information" button, choose a filename and save the file.