I have a feeling it is a broken world update, but I would like to get some feedback from the community. I have recorded a fairly detailed video of myself downloading the new files, running them, and converting my world over.
http://youtu.be/6_UXzMcvi2I
I did not alter the video in any way, which is why it is so long. So feel free to skip through the parts that take a long time (such as the world conversion progress).
Thanks for any help you can give!