If you go to http://www.pbwizard.com/HomePage.htm and scroll down the picture (grey) on the left is "copied" down. Using build 2002041803 This bug goes back to 0.9.8 - mozilla0.9.7 is working fine!
Problem is with PNG image loaded via CSS to background. -> ImageLib Same problem with 2002041711/RC1/Win2K
seeing this too on WinXP (1.0 RC1 build ID:2002041711)
*** This bug has been marked as a duplicate of 121230 ***
*** This bug has been marked as a duplicate of 123511 ***
Could be verified - no problem with 2002050208/trunk/Win2K.