Comment 11 for bug 895850

Found the cause of the dissappearing cameos in the defense tab and why no Yuri buildings are buildable.
They happen just because of too much stuff that are listed in the sidebar.
I removed all the civilian and unused stuff by using this;

Owner=Neutral,British,French,Germans,Americans,Alliance,Russians,Confederation,Africans,Arabs,YuriCountry
RequiredHouses=Neutral
ForbiddenHouses=British,French,Germans,Americans,Alliance,Russians,Confederation,Africans,Arabs,YuriCountry

Then everything went back to normal. I can see the cameos in the defense tab and Yuri's buildings does appear.
I guess they were somehow hidden from appearing on the sidebar because of too much civie crap on it.
Conclusion, modders can fix this on their own. Not sure about the defense tab though.
And it didn't take too much time honestly to put the codes on everything that had TechLevel=-1.