Joe, what devices are you using?

I have a Focusrite Scarlett 2i2 recording interface/mic pre-amp, and I also use a Focusrite VRM-Box monitor simulator. Both seem to be fine, they show up in the drop-down lists for input/output devices, and I've used them for listening to playback. I don't record and mix in Audacity - I use Reaper - but I do use Audacity for some editing and FX.

All seems fine for me, but I guess if you're using other devices, there may be drivers missing or some kind of conflict somewhere?