Windows 7 with Java 1.7.0
Put the summary of the bug you're having here
-What I expected to happen were the right textures of stairs and redstone.
-What actually happened was that the textures are stranges. Very stranges.
On the photo of my message, there's redstone on the command blocks and between the redstone lines (at the right of the red sandstone stairs).
MC-66970 Major texture disortion for Redstone, Stairs, Cobblestone Walls, Fences and Fence Gates