Quote - That is the surf line on the water in the scene. it only occures above final quality. Preview and final are fine.

I have experienced exactly the same problem, but never experimented with different render settings. I got rid of it by changing the Atmosphere. This is only a guess, but maybe I used an Atmosphere created in an earlier version of Vue, that is not compatible with Vue 7.4 Inf.

Adriaan Barel (a.k.a. Vege Mite)
"Morality, like art, means drawing a line someplace." -- Oscar Wilde