I was in my survival world, which i always play in snapshots. I went to my chest and found a prpled texture block where my map was. I thought it was an error so I crafted another one that was just like the first one, a map that was advanced by one tier, and it still showed up with the purple block texture.
Environment
Java Version: 1.6.0_27
Operating system: Windows 7
Singleplayer: true
Windows 7 Version: 6.1
Duplicate of MC-56868 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.