ATV doesn't see my Home Sharing

I have my MP6,1 connected via Ether to my Time Capsule, and my ATV connected via Ether to the same TC. Everything seems to be working, but my ATV cannot see my Home Sharing movies.

I have both the ATV and MP with HS turned on, and connected to the same iCloud account. The ATV simply doesn't see my iTunes.

Any ideas?