Exporting problem

I am making a shortfilm. I have drawn quite a bit at the point and just to check that everything goes well I exported the video.

Now here comes the problem.

My scene resolution is 4096x1716. When I export the movie it only gives me rainbow lines. Picture below.

I tried to export the movie with 3/4 of the resolution and it came out great.

When I render the movie and play it on ToonBoom Play it shows the movie great.

Does anyone know how can I get the Harmony to export the original scene resolution right?

Best regards,