Go into 'Emulator Settings' > 'Execution Settings'
For ZSNESW, Check these options:
Send ROM Path = Yes
Send ROM Extension = Yes
Use Long Filenames = Yes
Show DOX Box = No
I suspect 1 or more of those may be the cause of your problem...let us know if not.
Sorry, I have not tried the other emulator, but try out some of the above options. Also, look in the MAMEWAH installation folder for a file 'debug.log' after you have tried to launch a game - this file shows how MAMEWAH has 'tried' to launch the emulator.