I had a similar problem with the visual editor. I work there first: copy and paste my text and enter any images, then edit the images. Once that is done I go to HTML view. It seems like it works well as long as I am in HTML when I save. Saving when in Visual has made many messes and more work.
I’m still hoping someone has a solution to that recalcitrant scolling issue.
Thank for your feedback.
Sammi w/gemsviathailand.com