[Ugly gray rectangles around 3D-Objects]

OpenGL vendor string: Tungsten Graphics, Inc

OpenGL renderer string: Mesa DRI Intel® Sandybridge Mobile

OpenGL version string: 2.1 Mesa 7.11

OpenGL shading language version string: 1.20

OpenGL extensions:

[Ugly gray rectangles around 3D-Objects]

Hi,

I'm using a notebook with an Intel HD 3000 graphic card, Intel Core I5 2430M processor and Linux Mint 12 (64 Bit) on it. I just installed 0AD and checked out the functionality. Unfortunately I had to detect a graphical fault: Around some 3D-Objects and almost every building I built is an ugly gray rectangle:

Does anybody know how to fix this problem? Is the Intel graphic card the reason?

Edit: Here is a bigger version of the picture: Screenshot