Problem with flickering light in a cityscape project

Hello!

I’am actually working on a cityscape project, and i have got a problem with a flickering light. the Lamp is a sun one. I’ve found no previous topic talking about it.

Is it maybe due to the fact that i have many times the same stacked meshes…cause of this crap aspect that my buildings have. You can see theses problems on this video:

[video]http://www.fileden.com/files/2007/10/20/1525933/test%20ipnotika%[email protected][/video]

Thanks a lot for your help!

RUR

Here’s my project made with Blender 2.6:

http://www.fileden.com/files/2007/10/20/1525933/ville%20test%20Pink%20Ipnotik%20MESH.blend