Windows 7 Ultimate x64 Service Pack 1 6.1.7601 pt-PT
Put the summary of the bug you're having here
What I expected to happen was...:
The blocks rendering correctly in the inventory and when placed.
What actually happened was...:
In the inventory they render as a flat block and when placed they have missing texture.
Steps to Reproduce:
1. Give yourself double_stone_slab with dataValue 9 or higher;
2. Then place it.
Screenshot attached shows the issue in action.