First of all, I want to say, that I really like working with Lumion.

Last night, I tried to render (save) a film with different scenes outside and inside a house. The whole film is 3:57 minutes and the outside scene (1:00) was rendered correctly. But the first scene inside the house (1:00) was rendered totally dark. Only the light falling through the window came on the floor, the rest of all walls, all furniture, everything kept black. From the third scene on everything went OK again.
Was there "only" a mistake and I should try it again (the whole rednering took about 5 hrs) or is there a real problem ? What should I do ?

Hi aelg, can you try to render the dark interior in the Photo section, and post the result here?

Also, please run "DXdiag" in the Windows Start menu -> Click on "Save All Information", and attach the dxdiag.txt document to your next post (Click on "+ Additional Options" below the text field). This allows us to check which graphics card and hardware you are using.