Lighting bug inside bases - FLHDE/freelancer-hd-edition GitHub Wiki
This is not a Freelancer: HD Edition issue, as a matter of fact. It occurs on any Freelancer installation if you're running one of the latest Windows 10 or Windows 11 builds. If you're interested in learning more about it, visit this link.
The best workaround we can currently offer is a different Graphics API which you can select during the mod installation.
Simply select either of the two marked options and you should be good to go. We'd recommend using dgVoodoo since it offers additional graphics enhancements.