Created attachment 101992 [details]
Print screen of affected formulae
I created some formulae in an older version of Libre Office and they were fine, but when I downloaded the new version today, weird symbols appeared in them like clipart-style phones and mailboxes. I opened the editor to try to fix them but the symbols are there too
Please open the fonts folder, and check if there is a font called 'OpenSymbol'. In case you don't have this font, download it from http://cgit.freedesktop.org/libreoffice/core/plain/extras/source/truetype/symbol/opens___.ttf, and install it.
*** This bug has been marked as a duplicate of bug 76239 ***