This is a long shot.
While debugging our control surface code I have the option to "Attach to a Process" in the debugger.
If a file is loaded into Sonar, the process "Title" for the Sonar Process is HUDNow and has been since the skylight interface of X1 I think.
It likely refers to the main UI thread loop in Sonar but only the bakers know for certain.
In any rate, It does not refer to a HUDNow vst or something else YOU did. It just refers to the process thread that was executing when all it all went south. Could just as easily be called SonarMain or something.
:Ron