Hello. Does it work correctly if you run the game without MaLa involved? In other words, what happens if you type mame pacman?
Sorry, I actually tested that but forgot to write my findings.
The vertical games still displayed rotated if i ran them from the command line... its weird, because the windows version of advmame plays the games correctly...
But, in any case, I can say that the graphics card on this pc does weird things with MAME. For the benefit of the wider community, I'm posting a pic of the system settings.
This pc is actually my work pc and I was only using it to run MaLa to get an understanind of its interface and ability to be customised (which I ended up doing on my home pc). So, though MAME is weird on this pc, its no biggie.
But if anyone happens to know why and a workaround, I'd be interested...