After entering a new world on creative mode, i made to enter survival mode, but it wouldn't let me place or break blocks. Found the but on the demo seed if that means anything (-343522682) Bug happens when i use the /gamemode 2 command, but it's fine if i use /gamemode survival.
I couldn't place or break blocks and the highlight that shows which block i'm pointing as dissapeared.
1. Start a new world on creative. (Again i found the bug on the demo world -343522682)
2. Enter /gamemode 2
Game mode 2 is adventure, not survival.
http://minecraft.gamepedia.com/Commands#gamemode