Help failed to launch Forge

[Bretbert]

Hey, so I am running the latest version of Forge 1.6.4 (This is necessary for all my mods that I am using are 1.6.4). I am using Java 7 and i'm running the new launcher (The new one with its own run time). I have the following mods installed:

 

  Reveal hidden contents

 

Autoutils

Carpenter's Blocks

Chisel

Crafting Pillars

Custom NPCs

Elevators

Flenix Cities mods

Staircraft

WorldEdit Forge

 

 

When I start up the launcher it goes through the launching process and then just disappears off to it's Hawaii vacation or something. But it just disappears and I have no idea why. I did some research online and none of the problems I found were quite like mine. Here is a link to the log. http://pastebin.com/raw.php?i=ZVgS6ajM

 

Thank you in advance to anybody who can help!

 

[Bretbert]

Sorry I know it says on the EAQ not to do hidden tabs but I did the code for a spoiler. Sorry i'm new to the forum. Here is the mod list if you can't see it.

Autoutils

Carpenter's Blocks

Chisel

Crafting Pillars

Custom NPCs

Elevators

Flenix Cities mods

Staircraft

WorldEdit Forge

[Bretbert]

Okay so now here is my question. If I am loading a map that was made with 1.6.4 mods, and I update the mods to 1.7.10, then how bad will it corrupt the map if at all?