Why is text missing from Writer files?

I use LibreOffice Writer with a new installation of Linux Mint 15. What I write I password protect and save the file to a folder. Recently, I decided to copy each file to another folder without the password protection and saving everything to the password free folder under All Formats. At first all is well, but when I check the file later, the text is missing and all I have is the title at the top of the page. Has anyone encountered this problem before?

Just discovered that when I upload the file to Google Drive, the entire file is there!

What file format (ODT, DOC/X) are you using?