Hello , 
This is my first time installing this software , i aqquired an Beovision MX4000 CRT for use with Mame (mostly Arcade games) 
my system is Win 7 64Bit , GPU Radeon R9 380.  
I followed this guys guide for installing Groovymame  .
Everything was installed without problems.      
I use an dvi-i port , so with an dvi-i cable to vga - > into the usma scart adapter -> scart to tv .
i also see that that EDID emulation is detecting Output:  Digital_7 DVI-i enabled - GENERIC_15 
But i do have one problem unfortunetely i get an triple screen display on the crt
Any help appriciated