So I've been having problems with my steam since I updated it the other day. Every time I go to open TF2, it will just stay on the loading screen after the valve logo appears. I then have to force TF2 to quit and then I see that Steam "unexpectedly quit" and it says to re-open it. I have a Macbook that is version 10.6.8. I usually don't have any problems but this is just irritating. I'd really appreciate any help.