I have ended with spacepod, queens, and marines. Tried radio, planetoid, nothing happened. And I waited a long time (even set up camp, with stasis field in one case). Tried scroll, got to second stage, then again, nothing. Maybe my installation was bad. Never could find psionic ending.
Eloz, its not difficult for radio - u need kill all rubbish, and make sure big guns taken down. Or else u can wait for 1 million galaxy min and it wun happen.
For Planetoid, u need kill big green thing, and use that plantoid at the Altar in tat same place where u killy irky greeny.
For the psonic, related to green thing too.
Installation prob? try uninstalling, deleting the directory after uninstall manually, restart. Then reinstall. Else, simply install into a diff directory name after uninstall.