Steam Freezing when start

[Marcus15]

Today I have a update for steam, and now Steam freezing, yesterday I have't problems I played TF2. Now What?????

Error:
Steam: An X Error occurred
X Error of failed request: GLXBadContextState
Major opcode of failed request: 137 (GLX)
Minor opcode of failed request: 146
Serial number of failed request: 14986
xerror_handler: X failed, continuing
surface_opengl.cpp (785) : Assertion Failed: glIsTexture( nTextureID ) == GL_TRUE
Assert( Assertion Failed: glIsTexture( nTextureID ) == GL_TRUE ):/home/buildbot/buildslave_steam/steam_rel_client_ubuntu12_linux/build/src/vgui2/src/surface_opengl.cpp:785

Installing breakpad exception handler for appid(steam)/version(1361398000_client)
Uploading dump (in-process) [proxy '']
/tmp/dumps/assert_20130221184632_2.dmp
success = yes
response: CrashID=bp-aa0ded43-b513-49f6-87b8-f352a2130221
Steam: An X Error occurred
X Error of failed request: GLXBadContextState

Video:
http://www.youtube.com/watch?v=9_Bogz_iWBM&feature=youtu.be