comments disappear in docx files

[techwriterrc12]

We have a group that uses Track Changes Comments extensively. Since updating to Word 2007 docx, periodically all comments will disappear, leaving only the bubble. Usually the person opening the file will get an error message stating that the document cannot be opened because there are problems with the content. Then if they continue they are asked if they want to recover it. If they continue further, they are told that repairs were needed and a list appears including "Comments1, Drawn Objects1, etc." All comments are gone when the eventual file is opened. This is a file saved on a hard drive or server. The user is not trying to open them from an e-mail.



This is not a new problem. I researched it early last year and found incidents noted on the web but not in the MS forums. I resolved it by recommending to this group to always save down to .doc, which does not seem to have the problem. The problem has cropped up again in a docx file and I want to find out if there is any news/information about this difficulty. We would prefer to use docx files but not if they have this problem. Please advise. Thank you.