Stuck at "Loading world" Screen?

[Chrisizcool]

Okay so i downgraded my java from 7 to 6 and got it to not crash after the ftb animation. But now whenever i create a world it does not get passed the "loading world" screen. I have left it open for 5 minutes now and it is still stuck.
I put the parameter under my java preferences (on mac) under 64 and 32 : -XX:MaxPermSize=128M

I honestly dont know what to do. so mabye someone can help
Heres my log btw

http://pastebin.com/maLxifK7

 

[Bobbias]

I'm having exactly the same problem (though I'm running on Windows, as opposed to OSX)

I also recently downgraded from java 7 to java 6. I did get the same exception as you once, but this time I'm not even getting the exception, minecraft is just sitting there eating one core of my processor doing what appears to be nothing.

http://pastebin.com/dbfLxmhW

(I hope it's alright to report this in someone else's thread, but it appears that our problems are the same)

EDIT: I just got it working. I added the extra options:

-Xms512m -XX:PermSize=128M -XX:MaxPermSize=512m

and it worked. Perhaps this will also help the OP.