Quadrapassell has little variety in blocks that are generated when playing

I know it's a minor bug for a game, but quadrapassel is a personal fave of mine. I've noticed that in Ubuntu 12.04 that quadrapassel will frequently generate the same blocks over and over again, without displaying any of the other kinds. For example, in a recent game, the game showed the 2x2 box 10-15 times in a row before it switched to another shape, which was then generated another 10-15 times. With such little variety, it makes the game nearly impossible to play. I've checked the game settings, and it's set to level 1.