[libreoffice-users] Cannot delete certain blocks of text with grey background ("Readonly content cannot be changed...")

Hi,

I have a document that was sent to me in 'docx' format. Certain blocks of
text within it (always inside square brackets) are rendered with a grey
background. I can click inside the grey area and edit the contents, and I
can edit the rest of the document, but if I select an entire block of the
grey text and try to delete it, a dialog pops up saying:

    Readonly content cannot be changed. No modifications will be accepted.

There is only an OK button on the dialog.

I don't know what the grey background represents, but it seems to be more
than formatting (if I "clear direct formatting", the grey background
remains). I can delete all of the contents of the grey-background text, so
that it seems to disappear, but then I can't backspace past it (no error,
it's just that the backspace key does nothing), nor can I delete any block
of text containing what is now an invisible element (same error as above).

It's not a file permission problem, or some sort of
whole-document-write-protection problem, since I can edit other parts of
the document.

How do I remove these blocks of text?

This is in LibreOffice 3.4.5 under Ubuntu 11.10 (package is
libreoffice-writer 1:3.4.5-0ubuntu1).

Thanks,
Jason

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