VLC window resize with squares on Lion

[spawnerbr]

I have opened a movie file on VLC and then when I resize the window of VLC to see de video more large ou redeuce de window size, a lot of squares/mosaics appears on the video. It doens't happen when I play the same movie on Quicktime. I have tested all kind of video files (avi, mpg, mkv...) and it happens with all files. I have a friend with the same problem.
What it can be?

 

[spawnerbr]

Nothing?