Thanks for the help. Part of the problem is that I can't actually open any of the menus. Clicking anywhere in the app's screen just gives me a Windows error sound. Here are the requested version numbers:
TMFX Version (from the Properties of the TotalMixFX.exe file) is: 0.1.8.3
DF Dante Hardware Revision is: 56
I downloaded and performed the firmware update for the DF Dante.
One thing that strikes me as odd: Does it make sense that my 'control panel' for the DF Dante says "MADIface Series Settings" on it? I downloaded the drivers from the DF Dante product page... seems odd that this app doesn't say "Digiface Series Settings" or something similar instead. Maybe they're equivalent? Not sure if that's the cause of this issue or not, but figured I'd mention it.
Thanks again for the help!