[Solved] No Sound From Mixer to Sonar

SOLVED: Apparently, one of the plethora of buttons on the mixer got pushed that was killing the signal. Amazing how often it's the little things, huh?
 
I'm running a Behringer XENYX X1204USB mixer into Sonar. I've been using this setup for a few years with no problems. A couple months ago, I moved, and when I got around to setting my music stuff up a few weeks ago everything still worked fine.
 
Today, I tried to record something, and I cannot get Sonar to receive a signal. It acknowledges that my mixer is there, lets me select it, and it will play back through the mixer's output, but it doesn't receive any input whatsoever. I also know that the signal is getting from my guitar to my amp, and from my amp to the mixer, because it's getting from mixer to monitor without issue.
 
The only thing I can think of that MIGHT have any bearing on this is that I recently upgraded from Windows 7 to Windows 10.
 
Any advice would be greatly appreciated.