I noticed this in Survival mode after I was trying to get high enough from the dragon. I tried recreating this in Creative mode and sure enough it happened again.
Environment
Java Version: 1.7.0_45 from Oracle Corporation
OS: Windows 7 64-bit
MC-44013
The End Portal appears a whitish purple color about 52 blocks above it
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
EndPortal, SinglePlayer, end, multiplayer
Minecraft 1.7.4
Retrieved
End fog.