Launcher runs fine, but upon starting the actual app, 13w38a and later hang at the MOJANG logo screen. CPU pegs at 100% utilization, but game never progresses past this screen.
13w37b and earlier work fine; this started with 13w38a and exists in 13w38c.
Environment
Linux compatriot 3.2.0-53-generic #81-Ubuntu SMP Thu Aug 22 21:01:03 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.3 LTS"
Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
(i.e. Intel HD-3000 GPU - http://ark.intel.com/products/50072 )
java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)
I can confirm. Does not work on 13w39a, have not tried on 13w39b but so far its not working still.