I recently installed the public beta of Yosemite on a 27" iMac and upgraded to iTunes 12. (Upgrade in the loosest sense of the word). I use home sharing to access my itunes library through an Ethernet network on an ATV3. Since the installation I am finding frequently that I am unable to access the library on the iMac from the ATV. I need to switch home sharing off and back on again and restart my mac to make it work again. With mavericks this was not a problem and my mac would wake from sleep and work fine when required by the ATV. Is anyone else finding these issues, I could downgrade back to mavericks as I have appropriate backups from before I installed Yosemite, but I am loathed to do this if someone knows of a solution? I will of course send feed back to apple to help them fix the problem if it is indeed one affecting others.