So I read through this thread, and I'm still really confused about how the people a few pages back managed to stop getting a black screen whenever they started D2. There was a really technical post about manually changing permissions from 644, which I don't know how to do.
If someone could explain this to me/just tell me how to do it, I'd be eternally grateful.
And I already have all the right drivers installed and such, just get a black screen when I start the game (if it helps, I can't change any of the options from what they're already set as, IE change change from OpenGL or anything like that).
EDIT: Well I feel stupid, I figured it out not 10 minutes after I made this post. I just trashed all the diablo related files in ~/Library/Preferences and then changed it from OpenGL to software. Works fine now.