Sorry you're having trouble, will do my best to fix it! A few more questions: are you on OSX? There's a problem there because of which I can't do a certain optimization which might be causing the problem. Been trying to find a way to do this anyways.
It would also help if you could send me your savefile so I can see what's going on. On Windows, the game is saved under C:\Users\[username]\AppData\Local\pyramid2. On OSX: ~Library/Application Support/pyramid2. Just the save in question is enough. Thanks!
Edit: just uploaded v1.3. It fixes a freeze involving antelopes, makes the game run faster and improves the pathfinding.