Joining a specific in-progress DF group

[vanityobscene]

I just want to say that trying to join often DOES NOT WORK...

I have tried at least 4 times on both sides and it has failed to let the person join.. quickly at least

To be fair, timing, along with the particular instance, is everything. If you're fumbling around late - endgame dungeons at peak hours you're going to have a much harder time getting the sync up than you would during off peak and not so in-demand instances.