Hello,
I don't know if I'm the first getting this issue (I tried to found it on other posts, with no luck).
I installed (and reinstalled) GroovyArcade distro (64 bits) on a USB Stick and a SSD Disk (several times, for testing proposes).
I choose "Vertical" on "Monitor Orientation" when installing the distro to a disk, but the monitor orientation is always Horizontal.
I had to edit advancemenu.rc and mame.ini to get the vertical view.
Anyone noticed this?
The distro is very nice, boots quickly and runs fast! Nice Work!