Hello, this makes me really nervous when I produce a lot of videos per day, when I render mp4 for the first time, and when I want to do it again this error occurs. Full Sonar reset needed then, and it doesn't remember saving paths, parameters, so it takes another minute to render it again. I think this may be a pretty easy thing to resolve for a support team.
Morover remembering video rendering options as default "last used" could be a real help for my work.