Ok, I’ve pinned down what’s going on with the MAME2016 system selection menu. In the official MAME OSD, you use the TAB key to open up the OSD Main Menu and when you enter the “SELECT NEW MACHINE” submenu, the TAB key function is changed, so when you press the TAB key inside this particular submenu, the cursor jumps between panels. So far so good. But this behavior is not happening in the MAME2016 for Android, because when you enter the “SELECT NEW MACHINE” submenu and press the TAB key, it closes the OSD and go back to the game.
Is this an easy fix?