After upgrading to 5.0, Any changes made in "Settings".."Layout".."Post Options" don't make the changes requested.
Hi David Ligas,
Our current system settings already changed. Can you try navigate to Joomla BackEnd and check whether the post is it Inherit from default settings, if it doesn't changes than go to Joomla BackEnd > Menu Manager > Edit Menu Item > Posts
Check my screenshot: http://screencast.com/t/wyB94eJ5x , http://screencast.com/t/RvwwiAGZM
Hope this helps.