Slitherine

I've never seen this before today but in 2 multiplayer games I'm playing all growth has just stopped (one game I have over 30 regions the other about a dozen), every region is showing 1,000,000 food required for growth and it's killed any progress as all the slots are filling up. Can't remember doing anything in the game that would have caused this and as I said I haven't seen it before today, in one game it's been 4 or 5 turns with no growth the other has just started. Is this supposed to happen or has something gone seriously wrong?

Thank
Dean

Do you have the No Population Growth faction modifier listed on the Modifiers tab of the Nation Panel? This can be one of the effects of the Gather Food From the Land decision, and would last for 6 turns.