I installed, but it isn't blinking.

I couldn't have been more careful, either. I even changed:
Code:
$pmblink pmBox.bgColor='#8080A6';
to
Code:
$pmblink pmBox.bgColor='#FFFFFF';
to see if it would blink, but no change. My boards seem unchanged after this. I tried sending two different PMs to myself, too. Any ideas?
<edit> The color in the first code tag is actually a word that is getting parsed by vB </edit>