Minecraft block in the panel

Cannot confirm.
The stairs are rendered backwards at the moment, but this is MC-57895

Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.

When i restarted minecraft all its ok .

Crash report

Please install AMD Catalyst 14.4 (instead of the ASUS driver): http://support.amd.com/en-us/download/desktop?os=Windows+7+-+64#amd-catalyst-packages

Why ?

Because your driver

OpenGL: ASUS EAH5450 Series GL version 4.2.11762 Compatibility Profile Context, ATI Technologies Inc.

looks outdated and may cause such problems.