Cloth Baking stops randomly

I’m doing a scene with flags in it and I’ve set up the wind and cloth properties. When it comes to baking it does the first 26 frames fine but then stops baking as if it has finished. The bake time is set to 250 frames and the timeline is also 250 frames. Anyone know how to to make the software bake the entire 250 frames?

I’m using blender 2.5 Alpha 2