Hi,
I got a problem with lights on the final render of my scene and I don’t know how to fix it.
I’m still a beginner so I don’t know what is the problem.
The material of the window is a simple png texture with another png mask for the opacity.
Here is a video of the render: Video
You can see the problem in the windows of the building in the bottom left of the video.
Thanks in advance for helping me.

It looks like final gather flicker to me. Did you create any sort of final gather map? If not, and you don’t know what I am talking about, go to the help and search for “final gather rollout” and read about “Project Points from Positions Along Camera Path”, which I think would be fine for your slow moving camera. Also read the link there in the note about other ways you can get rid of flicker in other situations.

3ds Max 2013, Windows 7 pro 64bit.
MSI NVidia GeForce GT240, 1GB DDR3 (Driver 286.19).
i7 2.93Ghz , 16Gb CORSAIR Vengeance RAM, DX9.0c.