Show desktop = false is designed to allow emulators that will not go full screen to still be usable with GameEx. The idea is that if an emulator is set up properly and plays nice, when it launches, you don't want to see icons and such in the background for the split second while the program starts. If it doesn't go to full screen, then when the emulator launches it won't reside on top of the black HideOS.exe program (this is what show desktop = false runs). Anyway, the point is that if your program won't go full screen, you will have to resort to setting show desktop = true. If you have icons etc. on the desktop, I suggest you hide them if this is a dedicated cab. Either use the built-in windows setting, or, even better, shell the machine!