Kevstacey:changes in 0.4 psx4m-gui:
fullscreen switch
state slot selectors
frameskip selectors fixed(in 0.3 they doesn't work)
psx4m-gui is exit after starting psx4m(for decrease cpu\ram usage)
some small visual changes
so it's you choose to update to psx4m-gui 0.4 or not

Airtux,samipower thx