Don't know if this issue ever got resolved, but I'm having the same problem. All my emulators run prefectly except MAMEox. I've downloaded (twice) MAMEox128 Plus! 20060505 from the usual places, unrared and copied all the files over (F:\Emulators\MAMEoX128_Plus_ver20060505\). Both xbe files are in place, and I maintained the file structure from the rar. My dash (UnleashX) as well as XBMC both find it, but when I try to load it from either place, I get a blank screen. I've tried waiting a minute or so, pushing every button, and always have to reboot. I would greatly appreciate any help.