cada vez que pongo “play offline” enpieza a descargar los datos, y despues sale la pantalla de mojang, se me cierra y dice : Unpacking natives to C:\Users\Marcelo\AppData\Roaming\.minecraft\versions\1.7.2\1.7.2-natives-2478932152298
[13:00:46 INFO]: Reconstructing virtual assets folder at C:\Users\Marcelo\AppData\Roaming\.minecraft\assets\virtual\legacy
[13:00:46 INFO]: Launching in C:\Users\Marcelo\AppData\Roaming\.minecraft
[13:00:46 INFO]: Half command: C:\Program Files (x86)\Java\jre7\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -Djava.library.path=C:\Users\Marcelo\AppData\Roaming\.minecraft\versions\1.7.2\1.7.2-natives-2478932152298 -cp C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\15.0\guava-15.0.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.3\authlib-1.3.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\Marcelo\AppData\Roaming\.minecraft\versions\1.7.2\1.7.2.jar net.minecraft.client.main.Main
[13:00:48 INFO]: Client> [13:00:48] [main/INFO]: Setting user: Martiloco
[13:00:48 INFO]: Client> [13:00:48] [main/INFO]: (Session ID is token:7996ab9b2fda1f5b11913ccea492cc6f:587333f74dae4686ab0bfda02709a2ea)
[13:00:48 INFO]: Client> Exception in thread “main” java.lang.NoClassDefFoundError: gnu/trove/map/hash/TIntIntHashMap
[13:00:48 INFO]: Client> at cs.(SourceFile:14)
[13:00:48 INFO]: Client> at cv.(SourceFile:14)
[13:00:48 INFO]: Client> at cm.(SourceFile:9)
[13:00:48 INFO]: Client> at ahu.(SourceFile:28)
[13:00:48 INFO]: Client> at kb.b(SourceFile:355)
[13:00:48 INFO]: Client> at azd.(SourceFile:229)
[13:00:48 INFO]: Client> at net.minecraft.client.main.Main.main(SourceFile:84)
[13:00:48 INFO]: Client> Caused by: java.lang.ClassNotFoundException: gnu.trove.map.hash.TIntIntHashMap
[13:00:48 INFO]: Client> at java.net.URLClassLoader$1.run(Unknown Source)
[13:00:48 INFO]: Client> at java.net.URLClassLoader$1.run(Unknown Source)
[13:00:48 INFO]: Client> at java.security.AccessController.doPrivileged(Native Method)
[13:00:48 INFO]: Client> at java.net.URLClassLoader.findClass(Unknown Source)
[13:00:48 INFO]: Client> at java.lang.ClassLoader.loadClass(Unknown Source)
[13:00:48 INFO]: Client> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
[13:00:48 INFO]: Client> at java.lang.ClassLoader.loadClass(Unknown Source)
[13:00:48 INFO]: Client> … 7 more
[13:00:48 ERROR]: Game ended with bad state (exit code 1)
[13:00:48 INFO]: Deleting C:\Users\Marcelo\AppData\Roaming\.minecraft\versions\1.7.2\1.7.2-natives-2478932152298
[13:00:48 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[13:00:48 WARN]: Couldn’t delete C:\Users\Marcelo\AppData\Roaming\.minecraft\versions\1.7.2\1.7.2-natives-2478932152298 – scheduling for deletion upon exit

no entiendo lo que pasa, pero lo que puedo decir es que siempre que aparece algo asi, sale un link, lo copio y lo pego y dice acces deniged algo asi
ayudenme porfavor