Air Play Mirroring - video delay / no video

I'm trying to use AirPlay mirroring on my MBA and on my iPad3 through an ATV3, that is wired to new AirPort (TimeCapsule) set up on Dual Band 802.11 a/n-802.11 b/g/n (automatic).

On my MBA, I get a video delay of about 2 seconds, and on my iPad3, I get no video whatsoever, just audio.

Standard AirPlay works just fine, but AirPlay mirroring has a delay.

Anyone have any suggestions?

MBA is 13" Mid 2011, 1.8 Ghz i7, 4GB RAM, Intel Graphics 3000 384 MB.

iPad3 is Model MC707LL.

Latest iOS for ATV3.

Thanks!