Mint14+Cinnamon x86_64.

Open Beta client.

After logging in, steam asks me to confirm my email address. when I click yes, a popup with corrupted content appears, and I can't do anything anymore.

On the terminal:

$ steam
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 1 orphaned pipes
removing stale semaphore last operated on by process 29029 with name 0eBlobRegistryMutex_E90F93B68A2C26B4198C8DB4C686B278
removing stale semaphore last operated on by process 29029 with name 0eBlobRegistrySignal_E90F93B68A2C26B4198C8DB4C686B278
removing stale semaphore last operated on by process 29029 with name 0emSteamEngineInstance
removing stale semaphore last operated on by process 29029 with name 0eSteamEngineLock
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
[1220/080253: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 12: 48x256, total string texture memory is 49.15 KB
Generating new string page texture 13: 256x256, total string texture memory is 311.30 KB
Generating new string page texture 14: 128x256, total string texture memory is 442.37 KB
Generating new string page texture 15: 384x256, total string texture memory is 835.58 KB
Generating new string page texture 20: 64x256, total string texture memory is 901.12 KB
Generating new string page texture 21: 16x256, total string texture memory is 917.50 KB
Generating new string page texture 22: 24x256, total string texture memory is 942.08 KB
Generating new string page texture 23: 32x256, total string texture memory is 974.85 KB
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Generating new string page texture 25: 512x256, total string texture memory is 1.50 MB
Process 29148 created /ValveIPCSharedObjects3
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
local (potentially out of sync) copy of roaming config loaded - 0 bytes.
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Adding license for package 0
System startup time: 131.39 seconds
ExecCommandLine: "/home/REDACTED/.local/share/Steam/ubuntu12_32/steam"
Generating new string page texture 92: 1024x256, total string texture memory is 2.55 MB
Generating new string page texture 93: 128x256, total string texture memory is 131.07 KB
Generating new string page texture 94: 128x256, total string texture memory is 2.68 MB
Generating new string page texture 95: 256x256, total string texture memory is 2.94 MB
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: 0x240010f
Serial number of failed request: 18032
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: 0x240010f
Serial number of failed request: 18034
Uploading dump (in-process) [proxy '']
/tmp/dumps/crash_20121220080535_1.dmp
*** glibc detected *** /home/REDACTED/.local/share/Steam/ubuntu12_32/steam: corrupted double-linked list: 0x0c70aa00 ***

I saved the crash.dmp file