Large space at top of page on importing

Its strange I have been using it fine and then I imported two chapters of my book and found on opening each I had a large space at the top I could not remove. I wondered if I had somehow corrupted something in the doc files, I have now taken scrivener off and removed every file from reg as well so I can do a clean install, but will now wait for next update. I am concerned that there is no way to roll back to original screen if you mess up or am I missing something. Thanks Sue