Rdx
DSi support experimental!
Cos both Emulators are under development!
DSi NAND.bin? Right
This game original size is 240x320 [K800i]. I did it landscape rotation (320x240). Because I wanted to see what happens. But the surprising thing is that there is no problem...
You tried this version right? https://phoneky.com/games/?id=j4j14501 It's working for me without white screen error!  JL 1.7.4-open
Yeah, so device problem!
I tried this game, working for me. J2ME Loader 1.7.4-open 
Can you provide here those games? I will try..
J2ME Loader can support Mascot Capsule 3D! J2ME Loader = JL-Mod I think only different name and few words!