Figured I'd start a separate discussion for this, since the main page is usually kinda spammed with these requests. Anyway, here's mine:

I'm the author of Living Space, and in a recent patch I changed how my custom planet classes are declared. They no longer have a modifier, and instead just use a planet flag to prohibit the appearance of city/hive/nexus districts. To fix it, simply replace the old line with the new one:

Old:

New:

Thanks a million!