I was using a simple spreadsheet, where I researched PC parts, that I created a month ago, containing only text and simple sum formulas. I was using default fonts. Also I then test created some writer documents using default fonts (New file, press keys, save, close Writer, open).

This seems strange to me as well. Was wondering if I could trace what it is libreoffice doing in mozilla profile.

I also did dup from 42.2 couple of months ago but that was before I successfully created saved and reopened the spreadsheets. Had no problems after upgrading from 42.2.