Wood stairs problem and bloki fire and lava.

First: I am having problems with woodstairs in my server. Look the photo.
Second: How do I block lava, fire and flint? I have Blastcontrol, permissions, essentials, Nofire configurated! help
sorry my english...

 

Yeah I'm getting the same thing... :/

As for block lava, fire, and flint go into the Essentials config.yml and edit the "EssentialsProtect" portion (assuming you have EssentialsProtect.jar) There will be many options about what and what not to restrict. Creepers, explosions, fire spread, etc.

 

Are you using a texture pack? I get the same thing on one of my machines which is running one and not on the un-modified machine.

 

@Jeyge I am not using texture pack.

 

It's a known bug in minecraft

Code:

With Smooth Lighting turned OFF, new stair pieces have large black areas