[Solved] Cannot Edit "index.htm"

[mariusm98]

I have not been able to edit my files in C-panel for many months. Whenever I moved the cursor onto the "edit html"-icon, the text "javascript void" appeared in the lower left corner of the browser.

 

Now, all of a sudden, I can edit files, only not my "index.html"file. When I open it in the html editor only the first 30 lines of code appear, the rest seems to be missing. Only it can't be missing, since the page still displays well in a browser: mariusm98.heliohost.org

 

What could be wrong here?