May I first thank the developers of this wonderful piece of software. It is what I had wished for.
Unfortunately, I have a problem. When using the recording video camera and at the same time withing the final rendered video, the image is corrupted. What can I do now?
Sweet Home 3D is unable to compute too complex ceilings.
You should subdivide the room in smaller parts or don't display the ceiling of that room and add a box for the ceiling that you'll show only while the video is computed.