I haven't been dismissive of you at all.
If you want to provide more information such as screenshots of your emulators setup in Launchbox (if / when this issue occurs for you again) we will try and help you out. Screenshots of your edit emulator, edit platforms and associated platforms window would help out a lot, quite often when we dig into peoples setups we find a small but not so obvious error in the setup such as a path changed, platform name mismatch or the user changed the emulator and didn't transfer that change in Launchbox.