In LibreOffice set
Tools -> Autocorrect Options -> Localized Options -> Single & Double quotes => substitute standard quotes with special ones
1. Create a new .odt file by right clicking on the desktop or whatever you want.
2. Double click on this new file to open it: in these conditions the standard font is Times New Roman 12 instead of Liberation Serif.
3. Start to write something inside the document and quote it.
4. In these conditions the standard single/double quotes are used, and no substitution with the special ones happens.
On the contrary, if you:
1. Run Libre Office
2. Create a new .odt file from inside Libre Office
then this file uses the correct default font (ie Liberation Serif) and the substitution of the normal single/double quotes with the special ones is ok.
No idea of what happens in previous versions of Libre Office.
Created attachment 117384 [details]
screen clip of LO 5.0.0rc3 session with single quote and double quotes replaced by autocorrect
This works correctly for me. 4.3.7 -> 5.1.0 -- attached clip from 5.0.0rc3
Might verify the replacement quotes are recorded in the dialog, and start with a clean user profile.
*** This bug has been marked as a duplicate of bug 90286 ***