I've noticed in the newest snapshots that there's 2 possible texture glitches: Under fences it's completely black, and stacked iron bars show their top texture even though it shouldn't be showing. (My custom resource pack only changes the gui.)
Environment
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2703876864 bytes (2578 MB) / 3087007744 bytes (2944 MB) up to 3087007744 bytes (2944 MB)
Please don't put down the affected version as a future version, as you don't have access to it yet.