I get a "Segmentation fault" when i try to create an account in the Login Window of the Linux steam client (version 1.0.0.18) or when i try to login.

System: Ubuntu 12.10 64 bit
Kernel: 3.5.0-17-generic
CPU: Intel Core i7 2600k
Graphics: ATI Radeon HD 5570
Driver: Catalyst (fglrx) 9.00.11-120920a-147436C-ATI

Complete output of the application (create account):

Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Looks like steam didn't shutdown cleanly, scheduling immediate update check
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
unlinked 0 orphaned pipes
removing stale semaphore last operated on by process 5589 with name 0eBlobRegistryMutex_5900F4D8A6C6463F74E44F37D90B46C2
removing stale semaphore last operated on by process 5589 with name 0eBlobRegistrySignal_5900F4D8A6C6463F74E44F37D90B46C2
removing stale semaphore last operated on by process 5589 with name 0emSteamEngineInstance
removing stale semaphore last operated on by process 5589 with name 0eSteamEngineLock
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Gtk-Message: Failed to load module "overlay-scrollbar"
[0107/185257:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementation
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
GLError: 1282
Generating new string page texture 6: 128x256, total string texture memory is 131.07 KB
Generating new string page texture 7: 32x256, total string texture memory is 163.84 KB
Generating new string page texture 8: 48x256, total string texture memory is 212.99 KB
Generating new string page texture 9: 256x256, total string texture memory is 475.14 KB
Generating new string page texture 10: 64x256, total string texture memory is 540.67 KB
Generating new string page texture 20: 384x256, total string texture memory is 933.89 KB
SteamUpdateUI: An X Error occurred
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 20 (X_GetProperty)
Resource id in failed request: 0x300000b
Serial number of failed request: 2260
SteamUpdateUI: An X Error occurred
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 20 (X_GetProperty)
Resource id in failed request: 0x300000b
Serial number of failed request: 2262
Generating new string page texture 24: 8x256, total string texture memory is 942.08 KB
Generating new string page texture 25: 16x256, total string texture memory is 958.46 KB
Generating new string page texture 26: 24x256, total string texture memory is 983.04 KB
$/.local/share/Steam/steam.sh: line 287: 5692 Segmentation fault (core dumped) $DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"

Complete output of the application (login):

Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
unlinked 0 orphaned pipes
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Gtk-Message: Failed to load module "overlay-scrollbar"
[0107/185154:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementation
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
GLError: 1282
Generating new string page texture 6: 128x256, total string texture memory is 131.07 KB
Generating new string page texture 7: 32x256, total string texture memory is 163.84 KB
Generating new string page texture 8: 48x256, total string texture memory is 212.99 KB
Generating new string page texture 9: 256x256, total string texture memory is 475.14 KB
Generating new string page texture 10: 64x256, total string texture memory is 540.67 KB
Generating new string page texture 11: 16x256, total string texture memory is 557.06 KB
Generating new string page texture 12: 24x256, total string texture memory is 581.63 KB
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Generating new string page texture 14: 512x256, total string texture memory is 1.11 MB
Generating new string page texture 15: 384x256, total string texture memory is 1.50 MB
$/.local/share/Steam/steam.sh: line 287: 5589 Segmentation fault (core dumped) $DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"

I will gladly deliver any logs or other information if necessary to fix this nasty bug!
THX