I just filed bug 69445. Anyone know of this, or have a way of saving the situation? I know it's very unlikely but this is a very serious bug for me so I thought it couldn't hurt to ask...
Here's the problem:
The short version is that all my footnotes were gone when I re-opened a file. The actual superscript numbers were present in the main body of the text, as were the footnote numbers at the bottom of the page, but all actual contents of the footnotes were gone. There were 212 footnotes. I have a lot of work ahead of me... (The page numbers were gone as well, but I don't really care about those too much!)
I do note that one footnote survived. I think it may have been in a different style than all the others. It was simply "footnote", whereas I think all the others were "footnote text". I can't check since (multiple) earlier versions of the file have the same problem.
The file began life as a .docx created by Word (2007, I think, but it might have been 2010) on a Windows 7 box. I then worked on it using LO 4.0.5 on Windows 8 (I know, I know!). At some point I upgraded to LO 220.127.116.11 and continued to work on it. I'm pretty certain that once I upgraded to LO 18.104.22.168 I kept the program open (i.e. overnight) while I worked on it, and it wasn't until I closed the program and re-opened the files that the footnotes were gone. I was very, very sad.
The .docx file is not openable at all in Word (or by Gmail's "view document" feature). I was able to get a version that could be opened in Word by saving it as an .odt and then as a .doc (not .docx), but the footnotes of course were still gone. The original .docx can create a working PDF, but the footnotes aren't there.