I write most my documents using the Web Layout view. And most of them have a TOC
at the beginning. When new sections are added to a document and that I update
its TOC, the end of the document is broken. Sometimes its end is cut, sometimes
it's splitted. The only solution I found to fix the document was to switch to
Print Layout view and back to Web Layout. During this process I can see OOo
recalculating the document height because the scrollbar is jumping around,
indicating that the new height is longer that the old one, before I updated the TOC.

I will attach a test document and some screenshots of the broken views I got.

To reproduce the bug you can just copy a section to the end and update the TOC,
it should break the document in one of the two ways I described, depending of
the length of the new section. Adding 2 lines I got a cut document, adding a
whole new section I got a splitted document.