Tynator

Well in MAME you can set directories other than the original folder\roms and it will work fine IN MAME. But once you do that it won't work in Launchbox in some cases... funny fact is that it doesn't happen with all machines. I keep my emulation stuff stored in the same external HDD and face this bug in one machine and not in two others. All Launchboxes equally installed. I haven't really bothered figure why, just placed all my MAME roms in the original \roms and it runs smooth on all 3 machines. Quite a few users have reported this in other forums as well.

Have you tried placing the roms in the MAME roms folder (path where MAME is installed)? Launchbox has a bug and it won't run MAME roms located elsewhere on some machines...