Apple TV syncs but does not stream- Article: TS1447 not helpful

Question

My content does not stream from my Mirror Door computer. I have read the article listed above but System Preferences, Sharing does not offer the firewall setup posted, even though it was posted December 08.
When I first set this up it worked fine now it syncs and does not stream. I have hard rebooted the Apple TV, I have disconnected it from my current iTunes and then went through the process of re-associating it with my iTunes. All are most recent versions. Everything works fine except for the portion of streaming from my computer. I have not a clue! Any ideas? Is there a preference file I should delete?
Setup: Mirror Door connected to the new Extreme N.
*The Sharing panel does not have a Firewall option.*
This is the article:
Apple TV: Data does not sync or stream after entering passcode
Last Modified: December 02, 2008
Article: TS1447
Old Article: 305287
Symptoms
Once you have entered the passcode from the Apple TV on your Mac or PC to establish a syncing or streaming connection, the sync or steam of content may not work.
Products Affected
Apple TV
Resolution
This can result from a firewall being enabled on your Mac or PC. If you have a firewall enabled, please make the following adjustments:
On a PC
Make sure the firewall is configured to allow TCP connections on port 3689. This will allow the transfer of content for syncing and or streaming to your Apple TV. If you use Windows Firewall, see "iTunes for Windows: Music Sharing With Windows Internet Connection Firewall " for detailed steps. If you use other firewall software, check the documentation for that software on how to open port 3689.
On a Mac
Open the Sharing System Preference (choose Apple > System Preferences and then choose View > Sharing).
Click on Firewall.
In the "Allow" field make sure the "iTunes Music Sharing" check box is checked. This will allow the transfer of content for syncing and or streaming to your Apple TV.
If you use other firewall or internet protection software, check the documentation for that software on how to open TCP connections on port 3689.
Note: If you use "fast user switching" on a Mac with firewall enabled you'll need to enable additional ports to allow streaming to Apple TV. If you don't, only the first user will be able to stream to Apple TV. For one additional user enable TCP port 49152. For each additional user, open the next incremental port (49153 for three users, 49154 for four users, 49155 for five users, etc.).
Follow these steps to add the necessary ports:
From the Apple menu, choose System Preferences.
From the View menu, choose Sharing.
Click the Firewall tab.
Click New.
From the Port Name pop-up menu, choose Other.
In the TCP Port Number(s) field, type in:
491452, 49153
This example allows for a total of three users. If you need more, enter the additional number(s) as described in the note above. If you need fewer, just enter the first number.
In the Description field type in: Extra Apple TV streams
Click OK.

Answer 1

Click on the greyed out library and a dialogue telling you the library is unavailable will appear with an option to disconnect, I haven't actually tried this since if it does what I think it does it will delete my registration.
You may want to try the 'change library' option I mentioned before for the synced library, it may avoid you having to resync everything over.
Sync and stream are initiated from different ends, streaming doesn't work because you have changed your libraries and the tv no longer recognises them. I assume you moved your libraries over to your new mac, when you sync from itunes it uses the info from before you moved it and of course the tv is still the same tv so itunes recognises it and it will sync.