Still happening in 14w24b, haven't tried c yet but can say I found a duplicate: MC-64204
Pretty sure this is a duplicate of https://bugs.mojang.com/browse/MC-63720
Happens for me on my server started this summer. No swaying.
I opened it up in NBTexplorer and under these villagers' inventories there are 0 entries not sure if this is the same as MC-48735 or not.
Issue still applies to iron trapdoors in 14w28b
I took a look at MC-11193. This makes sense now. The redstone is updating in a way that makes the dispenser get locked because the individual block updates happen in an indeterminate order.
Also during night clouds are completely invisible when viewed from underwater.
Still an issue in 1.8-pre1, Banners don't sway in old worlds.