I feel weird, asking three questions in a two day period in which no one else asks anything, but...

I'm trying to make custom monster graphics for my game. I went into photoshop, did my editing, then saved it as a PNG file in the RPG2003\Rtp\Monster folder. In theory it should work, but when I go into the game I get nothing but a black screen where my picture should be. The file name is there in the list, the image just won't show up.

Help me BlueCube!