I am using the new snapshot 13w16a and launcher. I have some weird "Can't build areas" in my world. While building in one of those areas and my game crashed. I started the launcher and it said Launcher started...
Getting syncinfo for selected version
Queueing downloads
Launching game
Couldn't unpack natives!
java.io.FileNotFoundException: C:\Users\Noah "User"\AppData\Roaming\.minecraft\versions\13w16a\13w16a-natives\OpenAL64.dll (The process cannot access the file because it is being used by another process)
I can still use the old launcher but not the new one. I'm disappointed now because my horses are now gone ;(
MCL-61
MinecraftDev.exe Launcher won't open game
Resolved
Invalid
0
You still have the game running in the background which keeps the files in use by windows. Kill it manually and you should be able to start again.