It's worth mentioning that there was a bug on stable fallback where images using decimal coordinates for the x,y in the line specifying the sprite (instead of a move command) would cause the sprite to not show anywhere. Stable Fallback was just not able to process such sprites.
It was able to process move commands using decimals just fine though, which was a bit odd, so it could be fixed by using a move command instead and making the x,y coordinates in the sprite line some random whole number.
Stable and Cutting edge can both process the decimal coordinates for anything just fine, so it was definitely a bug that never got fixed in fallback because, well, fallback never got updated :p .
If for some reason you want to fix it to work on fallback as well... even though it's not even possible to switch to fallback anymore, and isn't supported at all, that change could be made. (but seriously, it's not supported, no reason to change a map to support a client version that the game itself doesn't)
pics for a more visual comparison:
This would not show up
This would
how I know this: an sb of mine from a bit over a year ago had that exact "bug" back when it mattered because anyone could use stable fallback, so I scratched my head in confusion why half the sb wasn't working for folks until figuring it out and then fixing it.
tl;dr: lanturn, as long as you're using fallback, most of the lyrics are most likely not gonna show up, so keep that in mind when you get the chance to recheck.
also, I just downloaded the set for the first time today, but the entire SB\f\glow folder is unused atm... delete it?
also "ring.png" and "light2.png" aren't in the .osb or any of the difficulties.