Graphic bug with blocks

Since months there are grapic bugs at minecraft like in the picture.
One block is invisible and there are some crazy lines .
Sorry for my bad english.
I hate this graphic bugs, because it's so annoying to play the game with this.

If you want to have more screenshots, i do my best to take more of it.
This bug is only in minecraft and there for at least 4 months, but i thought that it would be fixed.