Thank you. Yes, I have Seasons installed. It's currently summer and there are no festivals on.
There are just two humans and two cats on the whole of the map as I've only recently started playing with Seasons and Supernatural, which I bought in the sale.
I made a house and moved those 4 characters in, and then I saved and quit. Now I'm wanting to build a house opposite for my next family; however, I can't progress any further in the game as it boots me off as soon as I click save and anything I've done between loading the game up and clicking save is lost.
I'm running it on max settings through Steam, on a AMD quad core processor, with 4gb of RAM, GTX 560 ti card, 3gb of memory using Windows 7 ultimate 64 bit and directX version 11, with near on a tb of hard drive space.
As I say, it worked fine up until a few days ago, I think when a nearly 1 gb update was released on Steam.