Home Sharing not working with iPhone 5 iOS 6 Home sharing is not working on my iPhone : I can't see any 'shared' option in both music and videos app while I have activated Home sharing with the same ID on both my Mac and my iPhone.   
I have a MacBookPro with the latest version of iTunes and an iPhone 5 with the latest OS. 
I have tried to relaunch iTunes, turn off home sharing, sign out on my iPhone and start again the whole process without any result. And there's no issue with my router or firewall, I've checked all this. 
Does someone have any idea or tip to solve this problem ? 
Thanks a lot !

Edit - 08/10 12:03 GMT 
I set up Home Sharing on a second computer (with Windows XP) with the same Apple ID. I can see its library on both my mac and my iphone but I'm still unable to see my Mac library on the other devices. So, I think that the problem may be that my Mac "doesn't want" to share but is able to "receive". Any idea ?  Thanks
It's finally working. I quit all the services syncing over the air such as dropbox, evernote, wunderlist and bitTorrent Sync and restart my computer. It's working fine.
I've still no idea why it was not working before.
Thanks to you anyway