Can you please try to reproduce this? We have not been able to reproduce this problem. Thanks.
It happened to me only one single time yesterday. I will keep you up to date if I can narrow it down. Does Steam write some kind of logs I could post you?
Have you seen this happen since?
Closing pending a reliable repro.
Nothing extracted yet.
After quitting HL1 the Steam GUI was completly frozen.
Processor Information:
Vendor: GenuineIntel
Speed: 2000 Mhz
2 logical processors
2 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Unsupported
Network Information:
Network Speed:
Operating System Version:
Ubuntu 12.04.1 LTS (64 bit)
Kernel Name: Linux
Kernel Version: 3.2.0-36-generic
X Server vendor: The X.Org Foundation
X Server release: 11103000
Video Card:
Driver: NVIDIA Corporation GeForce 9200M GS/PCIe/SSE2
Sound card:
Audio device: Nvidia MCP77/78 HDMI
Memory:
RAM: 3006 Mb
Miscellaneous:
UI Language: English
LANG: de_DE.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 26812 Mb
Largest Free Hard Disk Block: 7709 Mb
Installed software:
Recent Failure Reports: