i know why (i dont know how to fix it though), its because you launched the game from the system menu. And when you exit neogamma (return to loader) it is trying to RETURN to the homebrew channel, but because we did not launch the app from the HBC, it stack dumps. This happens with a lot of homebrew even when using forwarder channels. Although I'm not sure if using a forwarder channel would still stack dump on exit, when I get home from work I'll test it out. If it does not stack dump on exit, I will also post my forwarder channel (if it also stack dumps, I won't bother posting it unless someone requests it).
I imagine this isn't a big deal because generally when u launch neogamma you will be starting a game, and once the game is started, u can quit to the system menu without any problems by using the home button like normal (and that won't stack dump as it is using the game to launch the system menu)
edit: @ syzyx2003, I'll share my forwarder channel once I get home from work (if you don't see it online within 24-hrs of this post, remind me cuz I probably forgot, lol)