This was first observed on a Multiplayer Server, and checked on Singleplayer.
Steps to Reproduce
1. Load the Minecraft Client (1.5.1)
2. Select Singleplayer or Multiplayer, and any world on any mode.
3. Place a strip of Slabs of any type against Ice Blocks
4. Attempt to view the slabs through the Ice Blocks
Results:
When approaching Slabs that are against Ice the space between the slab and the ice block flickers for a few seconds.
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Same result here. I think this is probably a duplicate of MC-8082 (most likely caused by any transparent textures) and the flickering is just z-fighting.
Confirmed, happens on fast graphics only.