iPhone's (iOS 8b2) flat-out refusing to sync my music from my Mac (Yosemite DP2), whether iTunes Match is switched on or not. Irritating.
Also, getting a *really* bizarre error where sometimes it seems to think my AT&T iPhone 5 is an iPhone 4S or something - it stops alternating indicators between "4G" and "LTE" and instead starts only showing "3G." This extends to the Settings app - which doesn't have the option to activate or deactivate LTE, but *does* have the option to turn 3G on and off (an option that shouldn't even exist on the iPhone 5, IIRC). Weird because, like, that's one of the things that the different versions of the beta for different hardware models are totally supposed to prevent.