Could some1 help me with mupen

[Aravis]

ok so i have downloaded mupen and have been playing on it for like an hour but then it just stops working. I started it up then load a rom then mupen quit
does any1 know hou to fix this

 

[Aravis]

Never mind i fixed myself

 

[Pyromanik]

Care to share
1) a more descriptive explanation of WHAT exactly was happening?
2) HOW exactly you managed to fix it?