Apple TV4 Home Sharing Stopped Working

I set up my Apple TV4 in January and Home Sharing worked flawlessly. I was able to click "Computers" and it showed all my music and pictures in my iTunes that I had running on my PC.

As of this week, I am no longer able to get Home Sharing to work on the Apple TV. When I click "Computers" it gives the message about turning on Home Sharing on iTunes for my email account.

Things I have done:

- Double checked that Home Sharing is on and iTunes is running (even turned it off and back on again and restarted iTunes a few times)

- Double checked that the iTunes account for Home Sharing is my correct email address (and logged out and back in a few times)

- Double checked that the under the iTunes "Sharing" Preferences menu, it is selected to share my entire library (and I unchecked and rechecked and restarted iTunes a few times)

- Unbplugged/reset my router

- Restarted the Apple TV

- Unchecked IP6 in my computer's Network Settings

- Restarted the Bonjour service on the computer

- Checked iTunes for updates

Everything else seems to function fine with the Apple TV. Very frustrating!

Thanks in advance for any help.