Question about bitmap image?

Im working on a game in flash and today I noticed one of my images was red. Before it was just a regular school background, but now its just completely red. I didn't turn it red or mess with it at all. This happened before and I just reimported the image, but now it happened again :yikes:
Here is what I mean: http://s1203.photobucket.com/user/Xx...fudge.png.html
Can someone tell me why this is happening? And how I can correct the issue? I got the BG from Sketchup and imported it into flash as a png.

hi,

import it again and keep a track of your library items, make sure you don't use remove unused items too often.
I had this happen numerous times in the past too, it's a pain I know