When i started my minecraft launcher, Downloaded it back just now and this happens. When I start it up, And put my login, It got stuck in a loop. this the only information i could get.
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Bootstrap (v5)
Current time is Oct 4, 2014 3:55:31 PM
System.getProperty('os.name') == 'Windows 7'
System.getProperty('os.version') == '6.1'
System.getProperty('os.arch') == 'amd64'
System.getProperty('java.version') == '1.7.0_55'
System.getProperty('java.vendor') == 'Oracle Corporation'
System.getProperty('sun.arch.data.model') == '64'

Looking for update
Downloading: https://s3.amazonaws.com/Minecraft.Download/launcher/launcher.pack.lzma
Got reply in: 703ms
No update found.
Reversing LZMA on C:\Users\Leon\AppData\Roaming\.minecraft\launcher.pack.lzma to C:\Users\Leon\AppData\Roaming\.minecraft\launcher.pack
Unpacking C:\Users\Leon\AppData\Roaming\.minecraft\launcher.pack to C:\Users\Leon\AppData\Roaming\.minecraft\launcher.jar
Cleaning up C:\Users\Leon\AppData\Roaming\.minecraft\launcher.pack
Starting launcher.
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Not sure what is going on and it's just the launcher itself. not a modded one.

Edit: I Just forgot some more information to add. I enter my login and it started looping. when i changed it again, it kept doing it. I couldn't even get to play anymore.

Edit: This is not happening to everyone but it's only me that is having the problem.

Edit: It works fine, but when i login, it gets stuck, Is it just my account on Mojang or me?

Problem Solved: The problem was the whole entire minecraft directory. If your having problems. Follow these steps.

1.) Delete your whole .minecraft directory, If your playing with a modded game, Make sure you hold a backup with forge, configuration files, and your versions folder.

2.) Relaunch minecraft launcher, Play.

3.) Now go open your backup files where ever you put them.

4.) Now go put it in the .minecraft folder. Run and play Minecraft! Have Fun!