To replicate the save game bug, just start a city, save it, then completely close down the application. Now start City Builder again, and go to Load Game, your save file won't be listed there.
On a side note, I thought the progression of time wasn't very realistic. I mean, a single farm is going to rake in more than $4 a MONTH. Also, since the game is based upon the time incrementing in order for changes to happen, years go by very quickly. I was thinking that technology would have been a BIT more advanced by year 2487.
Maybe if you had time going by a single day a time instead of a month, then it'd seem a little more realistic. $4/day for a farm is actually quite a reasonable concept. (Moreso than $4 a month anyway, lol) So, to save on time and keep things a little bit realistic still, you could have each month contain 30 days, but not SHOW what day of the month it is.
The one and only,