Idon'tcaarewhatthisis

Hi, I have spent a max of ten hours, just on this one world. It was working fine this morning. I was playing around with advanced genetics, and now it won't even load the world. I can load other worlds just fine, but the world that I care about doesn't. I click the world it gets to building terrain and then it says "Shutting Down Internal Servers." and It closes the world and goes back to the launcher. I'm really pissed off, I was so happy once I finally got it to stop saying out of memory. But now I have that feeling again. if anybody has any ideas I'd really appreciate it. Thanks