Best zoo game ever...but

I go on to play this morning and it has stopped letting me expand!!! Is there a limit on the game for how much you can expand? I have more quests and animals to put down and no matter where I click now it doesnt give me the option to expand anymore. Im like level 48 or 49... Please fix this. I play this game way to much to be all of the sudden not able to expand!

Ahope143 about Wonder Zoo - Animal Rescue!, v2.1.2