@mitu
Yes, I manually edit the gamelist files all the time to add games not picked-up by scrappers and to add missing artwork. Other than bad formed .xml formatting I never had any similar errors. Running with the --debug parameter fails to produce a .log file. I think that is since I have to kill the process in order to exit? I found the es_log.txt. It is the same as the pastebin link I posted earlier which doesn't seem to indicate the missing path.

Man, I wish more people were interested in the X68K :(

@Pyjamarama You can save your controller settings for that game or across the whole core. Those options are in the control menu in the hotkey+X retroArch menu, right above where you edit the control inputs.