I have had this issue in the past with earlier versions of LibreOffice on Windows (7.0.4), see this question Previous Question on Ask LibreOffice.
The above issue was tied to an Impress Template that was in Spanish Argentina and embedded fonts. I was able to fix that issue by:
- Going to the Impress Presentation File “Properties” and turning off “Embed Fonts”
- Switching to “English (USA)” for the language
- Closing and reopening the file.
Yesterday, I opened one of those Impress Files to edit it. I did the steps above on that file, but now every file that I open that uses Liberation Serif of Liberation Sans Fonts has these strange characters for double quotes, single quotes, and apostrophes. I have double checked the Language settings in the LibreOffice, they are set to “English (USA)”. I have double checked the default style which is also “English (USA)”. If I switch to a different font everything looks normal, and when I switch back to Liberation Serif or Liberation Sans I get the strange characters again.
I really don’t want to go through all of my documents and switch out the default font to something other than Liberation Serif or Sans. I use those fonts in my templates because I know that they will be there on both my Windows 10 install and my varied Linux installs. By the way these same files look fine on Linux in LibreOffice earlier versions (Debian’s 6.1, and Fedora which might be 7.0 or newer.)
As you can see from the screenshots below I have English (USA) turned on. Did I miss something or did opening that file that was encoded with Spanish Argentina cause a bug that has messed up my latest install of LibreOffice 7.1.1.2?