I had the same problem a few days ago with starting FS, black screen, and then crash to desktop.
Anyway, I deleted the module file and now when I start VatSim Squawkbox 3 and click connect, it pops up with a message:
"Connecting to Multiplayer Session via Lobby"
That will not go away. I waited for 5 minutes and it will not go away whatever I do. This means I cannot do an online flight
You'd be better off asking at one of the two forums below.