If you can PM me his IP address I'll forward it on to a Admin for him to be unbanned.
We've had a lot of issues with spammers as of late so we've been pretty brutal with IP range bans. Sorry about that.
Snes9x FAQs | Forum Rules
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!
I've commited Wraithverge's fix. Usually I can also be reached on the snes9x irc channel or via mail directly. There is also the issue queue on github.