Ok unfortunately I've had a few problems recently. Some how I broke the game in several places from things i've done. So I reverted back to an earlier version on steam.
So I've had to spend some time adding all the latest fixes back in and attempting to fix new problems I've found. I've done a fair bit of testing and everything now seems stable and working like it should.
Like I mentioned before I have been trying to also fix the NaN bug that can happen sometimes. It's basically because the game get's closed while writing to disk. So no data gets saved. So now the game save's less and prompts you when it's saving. Also it won't allow you to exit the game from the menu's when saving. So hopefully unless you close the game from force closing you shouldn't have the NaN error again.
With this new update as well as 50% off during the steam winter sale. It's a great time to get the game and support future development.
If you do experience anything let me know in the forums. As soon as the game is stable I can think about adding more content.
Happy Growing
-iDev