The relevant document was originally created in MS Word. I converted it into
a LO .odt and used to continue working on that document in .odt format.
After the issues occured, I saved it as .fodt and .rtf and it seems as if
the RTF conversion get rid of the inherited MS .doc issues.
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Sent
Self-reply:
I deinstalled LO 7.x and returned to LO 6.4.7.2 but that didn't help. The
issues (forgotten heading styles and footnote enumeration) seem to stick
inside the document.
What seemed to help was creating a new document and copying the whole
content of my 650 pages book into that new
