Issues with taito type games

Hi, i've problems with some of these games.

For example i can launch, via GameEx, KOF XIII but it runs "under" GameEx

Or in the case of SSFIV i can't mange properly the exit because when i close the game GameEx remains an icon on the windows7 taskbar. I've tried some combination with Map Keys and Advanced Config but i haven't had success. 

(here my ini files: http://www.gameex.info/forums/topic/13419-weird-behaviour-of-the-snap-and-video-previews-in-mame/)

Advice?

Thanks!