The launcher auto-updated to 1.6.76, and all I get for a launcher is a white box, minecraft icon in the title bar, no title, and that's it. This is the nativelog.txt file

Set run directory to C:\Program Files (x86)\Minecraft
Native Launcher Version: 1157
Operating System: Windows 7 Professional
Application Hash: 59395b36c0dc80a005337acec4c407dd57dfe389
Application Data directory: C:\Users\Sebastian\AppData\Roaming/.minecraft
Executable Path: MinecraftLauncher.exe
App Directory dir: C:\Program Files (x86)\Minecraft
Start dir: C:/Users/Sebastian/AppData/Roaming/.minecraft
Launcher dir: C:/Program Files (x86)/Minecraft/game
TmpDir dir: C:/Program Files (x86)/Minecraft/tmp
(Optional) Java Launcher hash:
Java Version: 1.8.0_25
x64: 1
Auto configured proxy is used
LauncherConfiguration from: http://launchermeta.mojang.com/mc/launcher.json
Downloaded config
Native launcher is current
Native launcher is current
Loaded upgrade id: 2689363204
Using new launcher as we're in the rollout!
Launcher library is up to date with hash 7cb412e4765071f4a084fc2252538c01ee80b563
Check to see if we can run the launcher
Native launcher is current
Starting launcher.dll with C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25\bin\javaw.exe
Found SetDllDirectoryW in kernel32.dll!
Added C:\Program Files (x86)\Minecraft\game to DLL search path
Running launcher!
Launcher ended with 0