Win 10 Audio Monitoring Stopped Working

[FullOutCreative]

Hello. I've been doing a series of 2-day events. Yesterday everything was fine, but getting ready to broadcast today, Audio Monitoring has stopped working. I believe it is related to a Win10 update - but I am not sure. I restarted my PC, toggled different audio monitoring devices and default, et al. My audio is broadcasting, so I'm in the 'clear' - but I can't monitor the audio.
Log File

 

[FullOutCreative]

Update (I didn't see a way to Edit the original post, I'm working off my Laptop while the Stream runs). My Laptop did not install the update, so I've added the Log File from that machine below - along with my Desktop (machine with the issue) for clarity.

I see a problem with the Monitoring Device & the CoreAudio AAC encoder. For Example:

Laptop (Working)

• 12:09:09.137: Audio monitoring device:
  12:09:09.137: name: Speakers (Realtek High Definition Audio)
  12:09:09.137: id: {0.0.0.00000000}.{2a5e387a-f0aa-47d3-9d61-b995f6b277c8}
  12:09:09.138: ---------------------------------
  12:09:09.168: [CoreAudio encoder]: Adding CoreAudio AAC encoder

Desktop (Not Working, Machine with Issue)

• 10:53:41.435: Audio monitoring device:
  10:53:41.435: name: AG271QG4 (NVIDIA High Definition Audio)
  10:53:41.435: id: {0.0.0.00000000}.{0f460376-96c2-4797-abfc-678ff3c539e5}
  10:53:41.435: ---------------------------------
  10:53:41.447: [CoreAudio encoder]: CoreAudio AAC encoder not installed on the system or couldn't be loaded

Log File from Desktop (machine with issue, same log file as original post)

Log File from Laptop (update not installed)