I can a little close to confirming this today, playing on whatever difficulty sets AI to 'bright'.
I started my normal cultural conquest strategy, and after two and half years i have a quarter of the map under my control. Near the middle there was a star cluster with about 8 habital planets, controlled by 5 different civs. I build two influence starbases and after about 5 turns, one of them finaly flips. Boom, in the next five turns the rest all flipped.
I found another such cluster of planets, though none with such diverse set of cultures (so more cultural 'defence') and did the same thing. All flip in a few turns of getting one to fall.
I then set up to do the same thing with two other clusters. I built a ton Constructors, piled them up. I built the MCC and then four starbases, two at each cluster. Right away, boom, 15+ cultural rebellion, 8 planets immediatly go into revolt, and i start click the turn button. I even set my expenses to nothing so i dont have to worry about building anything. After another year, not one planet flipped.
I'm kicking myself. What I should have done was save it before I built the MCC. Then I could compare the exact same effects of those influence starbases with and without the MCC. I will start up a new game tomorrow and see if I set that up.
Cornhusker, I have seen lots of info about the broken MCC, and looked at comments from Kryo, but I didn't see anything by him or anyone else confirming that the MCC PREVENTS planets from flipping. I may well have I missed that.
As I understood it, the 100% econ bonus was in place the missing revolution-inspiring effects of the MCC.
I, and many other people, believed the the MCC had NO EFFECT on plannet flipping, wether positivly or negativly. But it seems increasingly clear the the MCC is preventing plannets from flipping to my civ. (It would be ineresting to know if my planets can flip to other civs.)
I want confirmation, and a fix, if the MCC is indeed PREVENTING planets from flipping. I don't mind if the MCC keeps it +100% econ bonus, but it sucks that i can't flip planets period.