Apple TV won't load or play movies from my MBP library (through both airplay and homesharing), but will from my mac mini. Help!

I have been using my apple TV seamlessly with all my apple products (Mac Mini, iphone, MBP, ipad). Everything worked perfectly until recently (I noticed the issue about 3 weeks ago), when the apple TV won't load and play any movies from my iTunes library located on my MBP. The Library loads, and I can see everything, but as soon as I press play, the spinning load icon appears and doesn't stop. Same when I play movie from itunes directly and send it via airplay. Desktop mirroring no problem.
I have checked, and films are being played perfectly from my other devices, as does airplay and mirroring

Hello Tourneurm,
Thank you for contacting Apple Support Communities.
This article might be of use for your issue.
Troubleshooting Home Sharing
http://support.apple.com/kb/TS2972
Section 8 seems to be most applicable.
8. Cannot access my library when my computer is asleep
For Apple TV to access your library while the host computer is asleep, "Wake for network access" must be turned on.
Open System Preferences > Energy Saver and select (enable) the "Wake for network access" option.
In addition, the network that the host computer and the Apple TV (2nd or 3rd generation) is connected to must support Wake on Demand feature. This works by partnering with a service running on your AirPort Base Station or Time Capsule called Bonjour Sleep Proxy.
This article could also be of use.
Apple TV (2nd and 3rd generation): Troubleshooting playback performance
http://support.apple.com/kb/TS3623
Regards,
Jeff D.

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