Mark Repka

I am also seeing this problem on Ubuntu 12.10 x64 bit. Game hangs on startup on the Mojang splash screen.
My laptop is a Dell Inspiron with an Intel i7 and Intel HD 4000 Graphics. Various system information below:

mark@mark-laptop:~$ uname -a
Linux mark-laptop 3.5.0-37-generic #58-Ubuntu SMP Mon Jul 8 22:07:55 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

mark@mark-laptop:~$ pulseaudio --version
pulseaudio 2.1

mark@mark-laptop:~$ grep '^model name' /proc/cpuinfo | uniq
model name	: Intel(R) Core(TM) i7-3632QM CPU @ 2.20GHz

mark@mark-laptop:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

I manually triggered a crash to dump my system stats through Minecraft 16.4 (which works perfectly) and got the following:

Details:
	Minecraft Version: 1.6.4
	Operating System: Linux (amd64) version 3.5.0-37-generic
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 181795328 bytes (173 MB) / 439681024 bytes (419 MB) up to 477233152 bytes (455 MB)
	JVM Flags: 1 total; -Xmx512M
	AABB Pool Size: 13635 (763560 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: Mesa DRI Intel(R) Ivybridge Mobile  GL version 3.0 Mesa 9.0.3, Intel Open Source Technology Center
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 42 (2352 bytes; 0 MB) allocated, 12 (672 bytes; 0 MB) used

Please let me know if there is any additional information that I should provide!

When a player successfully logs in (and the skin server is up) the skin should be cached and used as a fallback if the skin server is down for some reason.