I had roughly the same experience but it was 10 years instead of 1. I just took the defaults for tax rates and stuff because frankly it already felt enough like doing my taxes just to get an idea of how the thing worked.
When you say it stopped, did it show a bankruptcy condition for you or more like a weird unexplained simulation stoppage? If the latter, I'll look into it right away, and if you can identify any simple reproduction steps that would be very helpful.
