[MAC OSX 10.6.8] Garrys Mod crashes when entering a server.

When I connect to a server, I crash every time. It might be affiliated with a thread somewhere in Facepunch. There are models that for some unknown reason crash the Macintosh. One of these is the Train wheel base.
I have tryed
Clearing Addons
Clearing GarrysMod
Re-installing Garrys Mod
Verify Garrys Mod
And a bunch of other stuff.
However, playing single player works.
I had this problem and it has not been resolved

To DatMeg, YOU CAN’T GET DUMPS ON THE MAC, thats only on the Windows Computers
iMac specs
Model Name: iMac
Model Identifier: iMac11,3
Processor Name: Intel Core i3
Processor Speed: 3.2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per core): 256 KB
L3 Cache: 4 MB
Memory: 4 GB
Processor Interconnect Speed: 5.86 GT/s
Boot ROM Version: IM112.0057.B00
SMC Version (system): 1.59f2
Serial Number (system): [CLEARED]
Hardware UUID: [CLEARED]
ATI Radeon HD 5670:

Chipset Model: ATI Radeon HD 5670
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: ATI (0x1002)
Device ID: 0x68c0
Revision ID: 0x0000
ROM Revision: 113-B9850K-133
EFI Driver Version: 01.00.416
Displays:
iMac:
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Connection Type: DisplayPort
Display Connector:
Status: No Display Connected