Also, for me the Act 2 ending Cinematic is not finishing. It halts abruptly when Azmodan smashes the grab. Usually hitches for a second so I can tell there is more, but it shuts off immediately and did not load the next cut scene. Ive tried re-loading D3, and nothing helps, it always ends there.
EDIT: In fact its doing it with all of the "live-action" cinematics now. Just tried to load the others. I think its related, as soon as the meteor hit the cathedral, the sound glitched, shut off the cinematic. Going to reboot and check drivers. Any other thoughts?