Thanks, Craig, for the info. I've removed the Font Awesome JS reference and can still see the icons, so that's good.
The bad news is that I still get the error posted in my initial post. Not sure what's causing it now. The only thing I thought each page with the error had in common was using Font Awesome, but it must be something else. I even removed all references to Font Awesome and still got an error.
I have a work-around, so it's not the end of the world, just a little annoying.
Thanks,
Chad