King_Of_Mayhem

I'm importing my new files from the same folder that successfully loaded all other games. (The ROMS folder in my MAME directory) I'm also copying the file into Launchbox as well as leaving the original in the MAME folder.

I'm having exactly the same problem with every new game I import since my initial collection importing. When I originally imported my ROM folder, everything ran sweet both in Launchbox, and Big Box. However, when I import anything new, it imports fine, loads all the artwork etc, but won't start the game, it just crashes. The only way I can make new games work, is to delete and re-import the entire collection, then it sees the new games. Running version 6.12 on Windows 10.