I used to have that kind of problem. Perhaps you could refresh the page by pressing 'F5' or the button itself.
Refreshes it until the full page is up. You could also go to tools-internet options and go to 'delete file' tab, click Yes. And OK afterwards.
Normally, it only needs couple of refreshments to reveal the composition page completely. That usually happens when there is some sort of interference with the connection. That I was told