You could unblock it...or just look on your list of blocked items.

I tried the background.
I don't want to take the time digging through the filter trying to find it. But what might have happened is, you blocked the bg image in simple mode, whereas I have everything defaulted to advanced mode and when I block something, it blocks the scripts as well.
So the piece of script that's making the link flash isn't blocked on yours.
Alternatively, you can go to your inbox and mark everything read. This will turn off the flasher.
I thought you
liked flashers.