If anyone wants to hammer through what broke the colour it's a commit between #2049 and #2070. Orphis won't let me download windows builds inbetween those (wtf? I've been having internet troubles lately though...). None of them look like they could have broken it to me, but I tested #2049 didn't have the broken colours, and #2070 did.
edit-those commits can be found on pages 51-52 in the ppsspp github commits list.
edit-those commits can be found on pages 51-52 in the ppsspp github commits list.