I have media on an powered external hard drive hooked up to a I-Mac. For some time now when I try and access media via Apple TV/TV2..it locks up I-tunes. I have to then force quit I-tunes to get I-tunes back in sync with the media on the external hard drive it seems. Sometimes I have to force quit/ re-open/ try and access with Apple TV/ TV2, 2 or 3 times before it works correctly again. Then it may stay in sync for a hour, a day very intermittent. I have replaced hard drive, re-built library, reinstalled I-tunes numerous times to no avail. Access to all on the internet works fine all the time on the Apple TV's, but access to my media has become extremely frustrating. It should be noted that I-tunes never locks up when working directly on the I-Mac, it is only with the Apple TV or TV2 that the issue arises. So not sure if a I-Tunes issue or a Apple TV issues or both in their communication with each other. Any ideas, help, experience with this.