Portal 'hl2_osx quit unexpectedly'

[0_omd]

I am getting this problem when closing portal

Process: steam [158]
Path: /Applications/Steam.app/Contents/MacOS/osx32/steam
Identifier: com.valvesoftware.steam
Version: ??? (1.0)
Code Type: X86 (Native)
Parent Process: bash [146]

Date/Time: 2010-05-14 21:35:20.799 +0100
OS Version: Mac OS X 10.6.3 (10D573)
Report Version: 6

Interval Since Last Report: 261917 sec
Crashes Since Last Report: 10
Per-App Interval Since Last Report: 69180 sec
Per-App Crashes Since Last Report: 5
Anonymous UUID: 5891F0B5-85ED-4A48-8846-31C4579AD37B

Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000005204d0
Crashed Thread: 2


This is my setup:
Model: iMac11,1, BootROM IM111.0034.B02, 4 processors, Intel Core i7, 2.8 GHz, 4 GB, SMC 1.54f36
Graphics: ATI Radeon HD 4850, ATI Radeon HD 4850, PCIe, 512 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 2.1.9.8
Bluetooth: Version 2.3.1f4, 2 service, 19 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: ST31000528ASQ, 931.51 GB
Serial ATA Device: OPTIARC DVD RW AD-5680H
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfd100000
USB Device: Keyboard Hub, 0x05ac (Apple Inc.), 0x1006, 0xfd130000
USB Device: Apple Keyboard, 0x05ac (Apple Inc.), 0x0221, 0xfd132000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0xfd120000
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0xfd110000
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfa100000
USB Device: USB Laser Mouse, 0x046d (Logitech Inc.), 0xc062, 0xfa130000
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8215, 0xfa111000
USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0xfa120000

Also can you give me the correct video configuration for my iMac 27"

[imacken]

You're not alone. Don't worry about it.

[0_omd]

You're not alone. Don't worry about it.

Oh good. Just I don't know what video configuration I should have my iMac at...

[imacken]

Just try out various settings and see what the frame rate readout is. Start with everything maxxed and see how it goes.
Target 60fps for a good, smooth experience.

[Neotyguy40]

I get the 'gameoverlay.ui' quit unexpectantly...