My AppleTV does not recognize my iMAC iTunes library

I have 2 AppleTV 3 connected via Ethernet. I have 2 desktops: one iMAC with OSX10.9 and a Win8. Both are connected to the same Airport Extreme. On both latest iTunes with home sharing is running. Now the wired thing: AppleTV always recognizes my Win8, even if its sleeping. My iMAC it does not recognize even if its not slepping, I do have to start files manually on my iMAC iTunes and send it to the AppleTV in order to be able to watch it. If the iMAC is sleeping (but not turned off!) it does not even recognize the home sharing, if iMAC is awake AplleTC rdcognizes it, but does not get beyond the selection of the iMAC and shows the waiting icon all the time. I went through all the (very poor) Apple support sites, haven't found anything that helps.
Also the Remote App on my iPhone or iPAD is not connecting to the iMAC, but to the Win8.
I had simialr problems before, it seems whenever there is an iMAC or AppleTV update it chages whether its working or not. Anyone having a similar problem plus solution?
Thanks!!

See Recover your iTunes library from your iPod or iOS device.
tt2

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My AppleTV does not recognize my iMAC iTunes library

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