Gaming Team Fortress 2 bug! NEED HELP!

[RandomFox$&]

Well I downloaded tf2 mac a couple of days ago since it was free. The thing is that when I get into a online match and sending client info finishes loading tf2 closes and it comes up with an error saying "hl2_osx quit unexpectedly". I've googled a bit but none of the fixes work. One strange thing is that I can join a server with know players on it and some of the classes guns dont show up. I can play offline fine though. For this reason Ive been playing offline and havent played online with anyone. Please!!!!! Help a NOOB like me. I'm on Mac osx10.6.8 with a NVIDIA GEforce 320m graphics card.
Ive Tried
Rebooting
re installing steam
deleting tf2 folder
validating cache files
Defragmenting cache files
But none of that worked

 

[Deleted User]

1. Have Pixle Shaders enabled
2. try Right click Tf2 in Steam > Properties > Set Launch Options > Then enter this: -windowed -novid -sw -w 1024 -h 768 lots of people say that fixes it
3. Try steam PC Version with wine

 

[RandomFox$&]

Number 2 didn't work and how do I enable pixel shaders on Mac?