Installed the Tiny & Big demo ( steam://install/214090 ) on a clean profile, and ran it from the Downloads view, this appeared in the terminal:

Game update: AppID 214090 "Tiny and Big: Grandpa's Leftovers Demo", ProcID 21917, IP 0.0.0.0:0
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
saving roaming config store to 'sharedconfig.vdf'
roaming config store 2 saved successfully
[filesystem] Working directory is /home/john/Steam/SteamApps/common/TinyAndBigDemo
[settings] Command line: /home/john/Steam/SteamApps/common/TinyAndBigDemo/tinyandbig --dialog=0
[assetmanager:211:warning] Bypassing asset management for file 'assets/scripts/settings.lua'!
[luaexport] Exporting Lua interface (Lua 5.1.5, Copyright (C) 1994-2012 Lua.org, PUC-Rio)
[settings] Parsing settings from assets/defaults.txt
[settings] Parsing settings from options.txt
[settings] Running in interactive mode
[settings] Running in retail mode
[filesystem] User data path: /home/john/Steam/SteamApps/common/TinyAndBigDemo
[logging] Log timestamp: Mon Jan 28 18:31:53 2013
[logging] Build timestamp: Thu Jan 10 20:50:05 2013
[logging] Build [#317](/issue/ValveSoftware/steam-for-linux/317)
[logging] Build URL: http://jenkins.fabs4d.de/jenkins/job/tinyandbig_binaries_steam/./label=linux,platform=x32/317/
[logging] Build configuration: retail static
[logging] Compiler: GCC 4.4.5
[logging] OS: Linux x86
[logging] CPU:  AMD Phenom(tm) II X4 840 Processor
[kernel] Kernel switch to State: KERNEL_INITIALIZECOMPONENTS
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
Setting breakpad minidump AppID = 214090
Steam_SetMinidumpSteamID:  Caching Steam ID:  76561197970948899 [API loaded no]
[steamcomponent] Steam API successfully initialized
[steamcomponent] Steam client is running
[filesystem] Couldn't find user data file 'default.save'. Application name = 'TinyAndBigGrandpasLeftoversDemo', user data path = '/home/john/Steam/SteamApps/common/TinyAndBigDemo'
[persistence] Saving player profile 'default.save' to Steam Cloud
userremotestorage.cpp (2619) : Assertion Failed: you're asking cloud about files before you've loaded the cache - it's going to lie to you
Assert( Assertion Failed: you're asking cloud about files before you've loaded the cache - it's going to lie to you ):/home/buildbot/buildslave_steam/steam_rel_client_ubuntu12_linux/build/src/clientdll/userremotestorage.cpp:2619

Installing breakpad exception handler for appid(steam)/version(1359221069_client)
Uploading dump (in-process) [proxy '']
/tmp/dumps/assert_20130128183153_1.dmp
john@joran ~/Desktop > success = yes
response:  CrashID=bp-544000a1-1b31-48cb-98c2-bfae82130128

Processor Information:
Vendor: AuthenticAMD
Speed: 3200 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:
Ubuntu 12.04.2 LTS (64 bit)
Kernel Name: Linux
Kernel Version: 3.2.0-37-generic
X Server vendor: The X.Org Foundation
X Server release: 11103000

Video Card:
Driver: NVIDIA Corporation GeForce GT 630/PCIe/SSE2

Driver Version:  4.3.0 NVIDIA 310.14
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 60 Hz
VendorID:  0x10de
DeviceID:  0xf00
Number of Monitors:  1
Number of Logical Video Cards:  1
Primary Display Resolution:  1920 x 1080
Desktop Resolution: 1920 x 1080
Primary Display Size: 18.78" x 10.55"  (21.54" diag)
                                        47.7cm x 26.8cm  (54.7cm diag)
Primary Bus: PCI Express 16x
Primary VRAM: 2047 MB
Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
Audio device: USB Mixer

Miscellaneous:
UI Language: English
LANG: en_GB.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 295295 Mb
Largest Free Hard Disk Block: 2410 Mb

Recent Failure Reports:
Mon Jan 28 18:32:23 2013 GMT: file ''/tmp/dumps/assert_20130128183153_1.dmp'', upload yes: ''CrashID=bp-544000a1-1b31-48cb-98c2-bfae82130128''