I have been working on my wiki for about an hour, and I keep having trouble with linking to other wiki pages

Once I create a link, the next line on my page jumps up like I have eliminated the return. When I place my cursor at the point where I need the return and enter, all of the page above the edit disappears. I tried to do one edit, save, and go back, but my login was lost. When I logged back in, it said that I was still logged into the page, and hadn't saved (which I did) and now all my changes are gone. I looked back in the history, and there is no record that I have worked on this at all tonight. This has been happening all day - different computers, different cities! Currently, I am using IE 7.