Text from Design view is not visible on View

I converted a project from RoboHelp 9 to 11, and discovered that several of my topics were changed.  Most of the changes were minor, e.g. spacing, bold type, bullets, etc., but I'm still having to go through each page, to make corrections.  Oftentimes, the "problems" don't show up until I View the topic, but up to this point I've been able to fix them.  However, one topic looks fine in Design view, but when I open it in View, almost all of the text is gone.  I've tried retyping portions, to see if it reappeared, but not all of it does.  Do you have any idea what is happening and how I fix it?