I'm running MXM, I've set the Telly to NTSC as I hate PAL 50 being in UK
I' m running through RGB scart, port makes little difference, if it's in port 2 then it will be player 2 so you need it in port 1 - to be player 1
Games I've tried
Operation Wolf, Terminator 2, Point Blank, Police trainer and a few others.
I've also resized the screen to fit my telly in mameox, not sure if that helps.
I also calibrate before each game - not necessary but I like to.
I've noticed the start menu doesnt have calibrate light gun unless I open it, close it then open it again.
using the gun to pick games is weiird
ps.
off screen reloading works as well.
and I did try all of the above with XPorts last version and it didn't work.
I have a PAL 1.4 Xbox with Focus Chip and I'm running it on an 14" Telly as I sit a metre from it hope this helps someone as I was about to put my sharpshooter on Ebay!