when i logged into my countrys and played turns, i was losing around 9k-14k civilians a turn and TONS of $$. finally figured out my tax rate was set to 0.
put it back to where it always is, and i was losing 13k-18k civilians per turn.
figured it was perhaps a glitch

at 0% tax you should gain pop unless you have lost land.

Did a country perform bioterrorism on you? Did you switch governments recently?