Have you updated your graphics driver?
The only way of updating a video driver on a Mac is just updating the entire OS, and I'm on the most recent version.
What graphics card do you use?
It's an Intel integrated graphics... can't remember which one. This same game works fine on the same laptop compiled under Windows, so I don't think that's the issue.
Does the problem also appear with the samples in SFML, or maybe even other OpenGL applications?
Not sure if it appears on the SFML samples; I'll check. Other OpenGL applications are fine to my knowledge.
Also what are you drawing? What do you mean with "video"?
I'm just drawing sf::Sprites and sf::Texts. By video I just meant graphical output