The question mark issue isn't an IOS update issue but an update of the Iphone app. I have an I-phone 3GS,4GS,and 5 and none of them now work since the app update. The 4 and 5 were updated but the 3 app was not updated. I can access the cameras on the laptop.
UPDATE: The 4 & 5 App started working tonight. No more question marks.