I posted this on the bug reports page, but I haven't gotten any answers there. This crashing has happened on multiple worlds I've created, I need someone to help me so that I can get my worlds back!
Here's my most recent crash report:http://pastebin.com/EvhQH3Na"
EDIT: I'd like to add that the crashing phenomenon seems to happen whenever I go near the volcano on the island. I don't know if that has to do with anything, I just thought it might be helpful info.