hi all - been lurking here for a few days. I'm happy with MaLa - thanks for doing this!!

I am tweaking minor annoyances that have been bugging me and I'm not sure where to start chasing this issue - need some pointers please.
Using MaLa 1.7 with a layout that displays marquees. The marquees display for most games, but there is one we play a lot that it will not even attempt to load the marquee.
the game is Do! Run Run, ROM name is dorunrun, I have a png file in the marquee folder named dorunrun.png, but the image will not show up.
I put MaLa in debug mode and there are no entries in the log file for it even attempting to load the marquee for that game. But, if I step down the game list to the next game (Mr Do!) it loads the marquee and there are appropriate entries in the log file showing that.
So my question is - what would cause MaLa to not even attempt to load a marquee file?
I tried updating my game lists - no joy there.
tia,
kp