Downloaded a Ruby ROM, which is clearly tagged as 'V1.0'.. downloaded this recommended patcher 'IPS Win 2.0'.. downloaded the IPS file from the original homepage of light platinum..
tried to patch it.. and I still got this white screen.. I really can't see it anymore.. How can this be ? I never got so much problems patching a game just like I do with Light Platinum.. it's just annoying.
Did you set your save settings to Flash 128k in your emulator?
Edit: Looks like the whole solution was posted earlier, read what Gykix said and it should work. It even worked on my gpsPhone too, playing this awesome hack on my iPhone ^_^