So I recently purchased the expansion after a long hiatus from GC2, and have a few things I need to work out. I read through the manual and browsed the web site, and can't seem to find what the deal is with various "uninhabitable" worlds. I was just playing a game where I found a radioactive class 27 planet. I quickly researched the necessary techs for the world and colonized it, but soon found that I was getting ZERO production from my factories on the planet. Unsure of what was happening, i researched the improved radioactive world tech (whatever it is called) and found that no much improved. I was still getting about 12 military and social production from 7-8 factories one of which was sitting on a manufacturing bonus.
I guess it comes down to this, do these planets have mysterious traits I don't know about and can find no mention of, or was this thing broke?