I have a pretty big problem. I use Word 2007 on Vista. I allow automatic
updates and am up-to-date on all updates (according to the automatic updates
page).

I am writing a 400-page book with 12 chapters, all in one 7KB file. I have a
lot of internal cross-references. I use pre-defined heading styles and I only
xref to headings. I use the Insert Cross-Reference dialog to create all my
xrefs.

My cross-references seem fine, but then for no reason that I can see, some
of them will become “corrupted”, by which I mean: when the heading text is
updated (with F9 or when it is done automatically) a bunch of text will be
inserted into the middle of the heading text. Sometimes several paragraphs is
inserted. If I click on the affected section, all of the new section is
shadowed in a darker color as if it’s a link.

The text that gets inserted seems to always be something that I had cut and
pasted in the past. I will get the same text inserted for a while, and then
another chunk of text (that also happened to be on my clipboard) will start
to get inserted. However, the text that is inserted isn’t currently in my
clipboard – just some text that I copied or cut a couple of days earlier.

This started a couple of months ago. At first I was unable to delete the
text that was stuck in the heading text; then I could remove it with
difficulty; now I can delete it easily. However, while it makes the text
nonsensical it is difficult to detect unless I re-edit the entire book, and
it is happening on a regular basis.

Can you help? Is this a known bug? It is making my book fairly unusable.