1.20.0 will completely lock up the graphics on the Mac very quickly if avatar is moved around a sim. The UI becomes jerky and suddenly the whole computer appears locked up. I can tell from audio that the Mac is otherwise running fine, but the graphics and UI are frozen. ***The only way out of this appears to be to power cycle the computer*** This appears to be avatar movement based, because I can use the flycam and the very nice SpaceNavigator to zip around the sim as much as I want, with no issues whatsoever. It only appears to occur when I am moving my avatar around the same locations. Below are my computer details and my SL graphics settings details: Hardware Overview: Model Name: MacBook Pro Model Identifier: MacBookPro4,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.5 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 6 MB Memory: 4 GB Bus Speed: 800 MHz Boot ROM Version: MBP41.00C1.B00 SMC Version: 1.27f1 GeForce 8600M GT: Chipset Model: GeForce 8600M GT Type: Display Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 512 MB Vendor: NVIDIA (0x10de) Device ID: 0x0407 Revision ID: 0x00a1 ROM Revision: 3212 Displays: Color LCD: Display Type: LCD Resolution: 1440 x 900 Depth: 32-bit Color Built-In: Yes Core Image: Hardware Accelerated Main Display: Yes Mirror: Off Online: Yes Quartz Extreme: Supported Display Connector: Status: No display connected BANK 0/DIMM0: Size: 2 GB Type: DDR2 SDRAM Speed: 667 MHz Status: OK Manufacturer: 0x7F7F7F7F7FF70000 Part Number: 0x00004B363435365536314535363637460000 Serial Number: 0x00000000 BANK 1/DIMM1: Size: 2 GB Type: DDR2 SDRAM Speed: 667 MHz Status: OK Manufacturer: 0x7F7F7F7F7FF70000 Part Number: 0x00004B363435365536314535363637460000 Serial Number: 0x00000000 System Software Overview: System Version: Mac OS X 10.5.2 (9C7010) Kernel Version: Darwin 9.2.2 SL Graphics Settings: High Custom draw 192 Max part 4096 post process - high shaders - all enabled mesh: objects - mid flexi - high trees - mid avatars - high terrain - high sky - mid reflection details : All avatars and objects avatar rendering: avatar imposters enabled, hardware skinning disabled lighting detail: nearby local lights. Hardware options: Anisotropic filtering OFF Antialiasing: disabled gamma 0.00 Enable VBO; Enabled Texture memory: 256 Fog Distance Ratio 4.0