System information:

Fedora 17 x86_64
AMD Phenom II X6 1055T
4 GB RAM
AMD HD 6870 (Catalyst 13.2 Beta drivers)

Output of running steam from the console:

Running Steam on fedora 17 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
unlinked 0 orphaned pipes
removing stale semaphore last operated on by process 5341 with name 0eBlobRegistryMutex_B06F8F447D4484692875517689C75E98
removing stale semaphore last operated on by process 5341 with name 0eBlobRegistrySignal_B06F8F447D4484692875517689C75E98
removing stale semaphore last operated on by process 5341 with name 0emSteamEngineInstance
removing stale semaphore last operated on by process 5341 with name 0eSteamEngineLock
Gtk-Message: Failed to load module "pk-gtk-module"
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
[0209/020709:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementation
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
/home/pabloc/.local/share/Steam/steam.sh: line 561: 6250 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"

It was working perfectly before the last client update.

Appreciate any comments or suggestions.

Thanks.