I have a teacher that is creating a content page with links to a PDF.  When in the edit screen of the page everything works and looks great.  I can verify that neither the link or the file are corrupt and open in-line as expected.  However, when we click "save" some of the text is blank and does not show up in student view either.  I have tried copying and pasting the lines of text to different areas on the page with the same result.  I have removed links and re-linked to new sources - same disappearing result. I have deleted and retyped the text - same result.  I have duplicated the page and the duplicate has the same result.  

Any thoughts?