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It is getting a little difficult to understand what is going on.
At first I thought it had something to do with the light presets so I used only simple emmiters.
It worked but then it crashed when I was working on another scene.
I was wondering if it was a material (texture, mapping or something similar) problem so I made a simple difuse mat for everything. No, it crashed again.
So, anyone found a possible reason for this major problem?

Check each material individually in a separete scene like a cube or something. I think materials in material editor can cause problems even if they are not used.