Using plus and minus to adjust volume and pan. Did something change?

I've been using plus and minus keys to adjust volume and pan setting in track view forever.  However, since the latest update, I now get a window in the upper left corner of the screen with a slider control that seems to have no affect on either the volume or pan settings.  I've looked in the manual and did a quick google search but found nothing.  Does anyone else get this?  Anyone have an explanation?  Thanks for your answers.

Thanks Steve, I think you may be right.  I'm afraid this may be related more to Windows 10 than Sonar.  Any idea how I can track this down?

scook
Check the notification area for the utility

I guess if I knew how to do that (or which utility) I wouldn't be back here again.

Thanks Steve.  I'm guessing it might be my nvidia driver.  It tells me that a new driver is available, but when I try to download it, it doesn't download.  I'm glad to know that Sonar isn't responsible for the behavior I'm seeing.