Q: I've done all of the above but I'm still displaying the message: to access your iTunes library on Apple TV, turn on home sharing in iTunes on your computer using ....... My home sharing is on ???? Confused, I've restarted and reset Apple TV with no change

You mention doing all of the above, what would that be exactly?

The article linked above is for airplay, have you checked home sharing tips?

http://support.apple.com/kb/ts2972

Same issue here.

- Can access shared library from all other devices.

- Followed Apple support advice and opened up the necessary ports on my Verizon router (which solved the issue for the other Mac's in my house)

- Reset the Apple TV

Still without success. Anybody any other ideas?

I am having the same problem. It used to work fine about a month or two ago. I did not knowingly change anything.