Saquenay
What is you locale? I sometimes run a Japanese locale, and it messes stuff up.
Thank you for the suggestion! Although I had checked all the language settings, the system's locale was set to something different (Chinese in this case). However, note that changing the "Language for non-Unicode programs" to English was not sufficient. I also had to change the settings in "Welcome screen and new user accounts". There, the settings for the Current user were correct, but I had to use the "Copy your current settings to" buttons below to copy them over to the "welcome screen" and "New user accounts" sections. Only after that last step did the font issue get fixed in Aurora. See attached screenshot.
All this being said, it might be worth investigating (though perhaps not as a priority

) if Aurora could inherit it's display choices from the "current user" profile rather than the default admin profile?