Welcome to Snes9x, then! Glad to have you on board.
I believe the sources are heavily documented; you can download the latest source, v1.53, at http://camoyoshi.x10.mx/mirror/snes9x/s ... rc.tar.tar
I can't remember any other resources that might be helpful at the moment. Sorry about that... Stick around and one of the port maintainers might show up and help you out.
And thanks for volunteering, as well!
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What operating system are you using? 32 or 64bit? Version of Snes9x? Is the text at the bottom of the window white when you load the game?
These suggestions are usually
the solution to your issue!