2x2 Jungle trees will no longer grow from saplings, I've placed a few around and had some left over from the pre-release and snapshots and they haven't grown. When bonemeal is used there's no particle effect and it'll consume the bonemeal but nothing will grow.

Suspected could be collision problems for the growth so tested in an open field, still nothing. Seem to occasionally grow on their own while in Jungle Biome but it is random and far between.