We discussed this problem
awhile back and it seems to be a problem that IE8 causes with some gadgets.
I started to get the "pink" outline on some gadgets when I first installed IE8 on my Vista x86 and it continued when I used certain gadgets with Windows 7 x64 and IE8.
I never really found a fix except to uninstall IE8.
Since I kept IE8 I just got rid of the gadgets that had the "pink" or corrupted outline and replaced them with comparable gadgets and have had no problems since.