After the first shot, the land does not get redrawn. I can still see all hedgehogs, mines, and the rain.
Each subsequent explosion will force the repaint of a horizontal stripe of land that is equal to the diameter of the blast.
Interestingly, addition of a construction girder causes the redraw of all land below it. Also, if I do a construction as my first move, the land is visible for the entire battle.
I'm using 0.9.4 but have also compiled the svn-same problem.
I see that there are some issues with integrated intel video, and that's what i have
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)