So MAME 151b won't launch with Launchbox but it works outside of Launchbox. Yes, I checked all my paths and haven't changed directories. I can confirm it's launchbox version 9.8 causing the issue because it works fine with 9.7. An issue I'm also having is that I can't install 9.7 on top of 9.8 because it won't launch. I installed 9.7 on a different drive and it works with the mame version I want but I can't get my license to transfer from 9.8 to 9.7 without it updating it to 9.8, which is not what I want. Someone please help me? I need either a way to get mame151 working in current launchbox (mame207 works fine) or get 9.7 running on my pc with my premium license that I paid for.