and after you get the 112 year thing you need to reopen it in a new window to fix that. once it messes up i think it stays that way
I wonder if that is browser specific....didn't happen to me. I was able to change it, but for some odd reason the math was way off....showed me still in the negative after all this time

(not that I probably am not in the red, but it doesn't need to show me that
)
