Steps to reproduce:

Right-click a game, select 'Delete Local Content...'
An 'Are you sure?' window pops up. Steam crashes when the mouse moves over that window.

Output:

$ steam
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)
[1220/034327: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)
PulseAudio connect failed (used only for Mic Volume Control) with error: Access denied
Installing breakpad exception handler for appid(steam)/version(1355957371_client)
Generating new string page texture 2: 48x256, total string texture memory is 49.15 KB
Generating new string page texture 3: 256x256, total string texture memory is 311.30 KB
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)
Adding license for package 11563
Adding license for package 13326
Adding license for package 13327
Adding license for package 13422
Adding license for package 12572
Adding license for package 12573
Adding license for package 13132
Adding license for package 13437
Adding license for package 11707
Adding license for package 13285
Adding license for package 7932
Adding license for package 14871
Adding license for package 14870
Adding license for package 14977
Adding license for package 14839
Adding license for package 1289
Adding license for package 2208
Adding license for package 11001
Adding license for package 4323
Adding license for package 14734
Adding license for package 15953
Adding license for package 16131
Adding license for package 16132
Adding license for package 15479
Adding license for package 13054
Adding license for package 16522
Adding license for package 16521
Adding license for package 12481
Adding license for package 17079
Adding license for package 14728
Adding license for package 4772
Adding license for package 13435
Adding license for package 16374
Adding license for package 14002
Adding license for package 16589
Adding license for package 18429
Adding license for package 16549
Adding license for package 8535
Adding license for package 12361
Adding license for package 12517
Adding license for package 18207
Adding license for package 11802
Adding license for package 7166
Adding license for package 8386
Adding license for package 13408
Adding license for package 17344
Adding license for package 0
Adding license for package 15638
Adding license for package 16360
Adding license for package 14938
Adding license for package 11793
Adding license for package 16020
Adding license for package 18629
Adding license for package 13602
roaming config store loaded successfully - 3212 bytes.
migrating temporary roaming config store
primarycache setting for app 65300 is set to non-existent cache 65304
ExecCommandLine: "/home/caleb/.local/share/Steam/ubuntu12_32/steam"
Generating new string page texture 72: 1024x256, total string texture memory is 1.36 MB
Generating new string page texture 73: 128x256, total string texture memory is 1.49 MB
Generating new string page texture 74: 128x256, total string texture memory is 131.07 KB
Generating new string page texture 75: 64x256, total string texture memory is 1.56 MB
Generating new string page texture 76: 32x256, total string texture memory is 1.59 MB
Generating new string page texture 78: 128x256, total string texture memory is 1.72 MB
Generating new string page texture 79: 512x256, total string texture memory is 2.24 MB
Generating new string page texture 80: 384x256, total string texture memory is 2.64 MB
Generating new string page texture 81: 24x256, total string texture memory is 2.66 MB
Generating new string page texture 86: 2048x256, total string texture memory is 4.76 MB
Generating new string page texture 87: 48x256, total string texture memory is 4.81 MB
System startup time: 16.29 seconds
ExecSteamURL: "steam://open/driverhelperready"
Generating new string page texture 89: 128x256, total string texture memory is 4.94 MB
Generating new string page texture 90: 256x256, total string texture memory is 5.20 MB
ALSA lib conf.c:3314:(snd_config_hooks_call) Cannot open shared library libasound_module_conf_pulse.so
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM default
AL lib: alsa_open_playback: Could not open playback device 'default': No such file or directory
Uploading dump (in-process) [proxy '']
/tmp/dumps/crash_20121220034356_1.dmp
success = yes
response:  CrashID=bp-e85e044e-274f-4475-987a-66cd92121220
/home/caleb/.local/share/Steam/steam.sh: line 287:  8268 Segmentation fault      $DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"

System Information

Processor Information:
    Vendor:  AuthenticAMD
    Speed: 3300 Mhz
    4 logical processors
    4 physical processors
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Supported
    SSE41:  Unsupported
    SSE42:  Unsupported

Network Information:
    Network Speed:  

Operating System Version:
    Debian GNU/Linux testing (wheezy) (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.6.10
    X Server vendor:  The X.Org Foundation
    X Server release:  11204000

Video Card:
    Driver:  NVIDIA Corporation GeForce GTX 460/PCIe/SSE2

    Driver Version:  4.2.0 NVIDIA 304.48
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x10de
    DeviceID:  0xe22
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1600 x 900
    Desktop Resolution: 1600 x 900
    Primary Display Size: 17.40" x 9.80"  (19.96" diag)
                                            44.2cm x 24.9cm  (50.7cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 767 MB
    Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
    Audio device: 

Memory:
    RAM:  8004 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  910739 Mb
    Largest Free Hard Disk Block:  168161 Mb

Installed software:

Recent Failure Reports:
    Thu Dec 20 10:19:13 2012 GMT: file ''/tmp/dumps/crash_20121220021912_1.dmp'', upload yes: ''CrashID=bp-75ca0295-ce5c-4a5e-9669-5cc1c2121220''
    Thu Dec 20 10:34:35 2012 GMT: file ''/tmp/dumps/crash_20121220023434_1.dmp'', upload yes: ''CrashID=bp-9b9c248e-9a79-4ef2-9299-95dd42121220''
    Thu Dec 20 10:35:06 2012 GMT: file ''/tmp/dumps/crash_20121220023505_1.dmp'', upload yes: ''CrashID=bp-7bf223db-a0cb-4c3a-aad6-a91bf2121220''
    Thu Dec 20 10:35:50 2012 GMT: file ''/tmp/dumps/crash_20121220023548_1.dmp'', upload yes: ''CrashID=bp-ac8f250c-c83b-4c4a-8a86-9c1dd2121220''
    Thu Dec 20 11:39:22 2012 GMT: file ''/tmp/dumps/assert_20121220033921_1.dmp'', upload yes: ''CrashID=bp-1326126f-982f-4545-a18c-e26842121220''
    Thu Dec 20 11:39:39 2012 GMT: file ''/tmp/dumps/crash_20121220033938_2.dmp'', upload yes: ''CrashID=bp-4fbbd66f-ee9e-41e7-9c6c-26d9b2121220''
    Thu Dec 20 11:40:03 2012 GMT: file ''/tmp/dumps/crash_20121220034002_1.dmp'', upload yes: ''CrashID=bp-b8b307ad-cd6f-4438-b268-397f02121220''
    Thu Dec 20 11:42:56 2012 GMT: file ''/tmp/dumps/crash_20121220034255_1.dmp'', upload yes: ''CrashID=bp-8a4aaf41-1b23-498c-9260-496b52121220''
    Thu Dec 20 11:43:57 2012 GMT: file ''/tmp/dumps/crash_20121220034356_1.dmp'', upload yes: ''CrashID=bp-e85e044e-274f-4475-987a-66cd92121220''
    Thu Dec 20 11:55:27 2012 GMT: file ''/tmp/dumps/crash_20121220035526_1.dmp'', upload yes: ''CrashID=bp-c5dffb53-b92d-4175-a730-4e1ee2121220''
    Thu Dec 20 11:59:30 2012 GMT: file ''/tmp/dumps/crash_20121220035929_1.dmp'', upload yes: ''CrashID=bp-4994bd07-0c76-4e69-9466-cadfe2121220''
    Thu Dec 20 12:01:54 2012 GMT: file ''/tmp/dumps/crash_20121220040153_1.dmp'', upload yes: ''CrashID=bp-89779954-a011-4197-b7f9-d2f792121220''