Horntail Glitch.

I wasn't around when the glitch started but for the past few weeks I've been in a group that has wanted to kill it, we've found it incredibly frustrating that we encounter so much drama trying to run as a large group (read: we're not very strong individually) when most people just breeze past and solo it, since we'd take up lots of the slots. I don't see why, if nothing else for larger servers, there aren't either instanced versions of these boss dungeons on a single channel or more than a few channels that bosses can be run on. I really don't see how/why this glitch hasn't been resolved already, even for Nexon, an entire year? That's awful. Population is a problem at Zakum/CZak as well but at least you don't get disconnected there.

Edit: BasilMarket thread informs me that it was one year today the glitch started.