I'm one of the four. hehehe I don't use the ignore feature at all. Tonight, I decided to try it out to see how it works. She happens to be one of the guinea pigs. Although the counter increased, I can still see all of sublime's posts and the others too. I left the ignores on for awhile to see if it's on some sort of time-delay activation. Still nothing.
Oh well, I'll take her off now. The number should go back down to 3. So, you have one solved. :)