I seem to be having the same problem. I am at level two on everything. There is algae in the ocean so they don't fish. They have depleted the coconuts, and the fields and they only have 615 food points. The next crop is due in 90 minutes. I have 16 villagers. Before this the crops were coming in every 30 minutes or so. Is this a normal occurance? One other thing.. is it normal that reasearchers and farmers become masters quickly, but builders take years. I have one builder that was an apprentice builder as a child, and they still have not become a master even though they are in their twenties, and only work on building.
Thanks for the help, and despite these little problems, I love the game.