NOTE: this problem is for all my trackball games, not just Centipede and Millipede.
My system is not up-and-running at the moment to check ini files.
My problem may be related to the way I made my ROM lists for Mala. I was having problems making 2 specific rom lists so I manually sorted roms into two folders named: Trackball games, Fighter games.
I dragged the contents from Fighter Games folder into the default Roms folder, made my Master List with Mala, then made a secondary list called Fighter Games. I then Deleted everything from the Roms folder and repeated everything for the Trackball Games.
I ended up with two working game lists I can choose from using the Mala interface.
Then I dumped all roms together into the Roms folder.
There were only Fighter Games in the the Rom folder when I had Mala make the original XML file. Would that cause my problem?