Quote Originally Posted by 'puppychow',index.php?page=Thread&postID=177623#po st177623
You were probably running into the issue of your team can only zone into 5 different versions of the instance per hour (limit to prevent cheat farming, etc),
That isn't what he is referring to. It has happened to me on two, maybe three occasions (on a medium-pop server that has the occasional 50-300 person queue for a short time). I don't know if it's due to population or something else, to be honest. What happens is that I try to zone into the instance, I see the loading screen for a split-second, then I am back outside of the instance, with a 'raid-warning' type of message saying something to the effect that additional instances cannot be generated at this time, try again later. After 2-3 more attempts to zone in, I will get into the instance.

Since it only takes me a couple of extra attempts to get in, it hasn't been a problem for me. At worst it costs me a minute of time. I don't know how widespread it is, though.