Qt + SFML: drawing only half sprites :S

[N1ghtly]

I've finally been able to set up Qt with SFML and I've already run into another problem
I have a QDockWidget which contains a TileCanvas. ( a derived class off QSFMLCanvas, from the tutorial) I draw my sprites on it, but  once I try to draw past ~100 pixels, it stops drawing. It even draws half sprites like that :/

Here's a picture:


I don't know what the problem is, help!

[Haikarainen]

Post some relevant code.