[racket] All black images...Ahhh

I just recently started coding a game in scheme and am noticing an issue
when loading PNGs.
This issue happens RANDOMLY on RANDOM image(s). So, its not just one
particular image.

well, i forgot to say the issue...the issue is that the images are full
black. The image shape is evident and clear, but is filled with all black.
I capped the memory at 512 MB.

(define OVERLAY-RED (bitmap "src/bg-overlay/red.png")) ;; ex. of how i load
the images

Any ideas?

Lemme show you the issue:

Picture 1: Notice the RED blood: THIS IS THE GOOD ONE

http://img829.imageshack.us/img829/4864/65490383.jpg

Picture 2: Notice the now BLACK blood: I have tried to point it out using
arrows: THIS IS THE ERRORED ONE

http://img130.imageshack.us/img130/7563/76349361.jpg

Thank you all for help.

Mathew
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