Dear Kay,
Most of the problems caused by using newspaper for bedding are related
to the clay content in the newspaper. The clay is what made your
compost so rock hard.
If you are having problems with bugs and flies when you use leaves for
bedding, perhaps you should try letting your bagged leaves sit outside
long enough to get really really cold in the winter, so the bugs die
out. Or, you could let tightly sealed black bags of leaves sit out in
the hot summer sun long enough to really cook inside. Both extremes
would probably go far in reducing your bug infestations.
I have not really had fly problems caused by leaves. You might also want to make sure that you are harvesting leaves from areas that are completely free of animal droppings.
Good luck! Let me know how it works!
Environmentally yours,
Ellen