Quadrapassel flashes on and off when used...

Hello,

The game called which is now called Quadrapassel (a.k.a Gnometris in the past) works very strangely on my computer. When I open it, there is nothing but grey until I click new. When I click new (game), the background appears for about 1 second and I see the shape which is falling, but the screen turns grey again. This happens throughout the games: every time a new shape appears, the background and shape are visible, but they get covered by gray again everytime, and when I move the mouse around, everything stays gray no matter what. I do not know if this is due to my computer or some sort of setting, but I think it is. My brother has the game too on his computer, but his works and mine doesn't. We both have Ubuntu 10.4 Lucid Lynx; the only difference is that my brother has the 32-bit version and I have the 64-bit. I know a bit of programming, but I do not consider myself a too experienced or talented one. However, if there is a solution to my problem that involves a bit of programming or modifying scripts or something like that, I should be able to do it as long as there are relatively clear explanations.

I know this isn't a too important problem, and I am disposed to wait for quite some time before getting some answers, but I would enjoy being able to play Tetris without going to an online site on my computer.

Thank you very much for your time and help.