@engineer,
Well, my opinion differs there from Jes and Engineer
I believe, if you read a lot of the board, it can be fairly easy to see who ignores who(m)... especially after there's been a dust up of some sort! Also, whether they've used the ignore feature is immaterial IMO (other than for the person who used the feature for the purpose of not seeing someone's posts completely)... if someone ignores a direct question that you are asking - then pretty much, whether it's just because they don't wish to answer at that stage (or whatever) or because they have you on ignore, for all intents and purposes - you
are ignored.
Then, agreeing with Set, if that happens I see little point in addressing that person directly again, in that particular thread and possibly in other threads.
If you need to get a point across then you use the reply to all - so even if you are being ignored you can still engage with other folk.
If you believe you're being ignored, you probably are! (even if the ignore button hasn't been pressed)