Luckily for them it was only the Azphel server. They're getting it taken care of and compensating Azphel players with a few bonus XP items for their lost time, though I feel for those who weren't a part of the bug at all and still lost all that time spent leveling, crafting, gathering, etc.

These things happen, unfortunately and as much as the word "rollback" makes most MMO players cringe, there's no other way to truly ensure that all that kinah is wiped away.