It turns out a chicken tried to get to a house but couldn't open the door, so it got stuck. ;)
I'm not sure why, but your save is corrupted, it doesn't look serious, only the "discovered world" directory seems to be missing. If you create an empty folder named "discovered_world" inside your save you should be able to play it again.
The rain issue is patched in v0.5.0.2.
Hey, I've just run into the issue slowing down another of my saves significantly in 5.0.1 (10-20 second halt between turns), so I'll be waiting for the patch and I'll see if I can confirm it fixes that one.
EDIT: Also, I'm not really sure why the discovered_world directory is missing, given that it's present in my zipped and unzipped versions. Maybe it got messed up somewhere in the decompression process.
