Snes9x uses it's own custom license:
Permission to use, copy, modify and/or distribute Snes9x in both binary
and source form, for non-commercial purposes, is hereby granted without
fee, providing that this license information and copyright notice appear
with all copies and any derived work.
Basically, you can copy, modify, or distribute in either compiled or source, provided you don't use it to promote a product that is for-profit. They also request that you give credit to all authors. (A list of them can be found in the licenses.txt that comes with every snes9x package.)
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes,
but is not limited to, charging money for Snes9x or software derived from
Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
using Snes9x as a promotion for your commercial product.
Like I said earlier, you can't use Snes9x in a portion of your product if that product is sold for any amount of money.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
If you make any modifications, please share them with everyone else "for the good of the emulator", per se.
Hopefully this helps!
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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!