Cities have gone!

I remembered how I enjoyed this game on Windows several years ago.
This game reminds me the excitement at that time.

However, on this Mac app version, city datas disappear very often.
Save a city, go back to the region, then the city is gone!
I really cannot play this game.
Please fix the bug asap.

yvrngo about SimCity™ 4 Deluxe Edition, v1.1.0