Mac World not loading on Ultimate

[Alec Chu]

Everything is fine until I attempt to load or create a world. After a few seconds, it just seems to stall for over an hour so I can't get to my world. It doesn't crash.
http://pastebin.com/GsgVaJVy

 

[Guissepi]

I have a very similar issue
http://pastebin.com/GP7LXPkt

 

[leosayer]

Guissepi, your error shows you are running out of memory, try adding the java parameters Booker lists here: http://forum.feed-the-beast.com/threads/detected-leaking-worlds-in-memory.12098/page-7#post-157630