Do you use addon manager, and if you do could it be you have the addon disabled there? And do slash commands still work?
I haven't had any addons disappear, but like Mega I have noticed a substantial drop in addon developers recently, which on the whole can't be good for the game. Personally I have a couple ideas for addons that I'm starting to work on, but there aren't very many good guides as to how to make addons, and it's not very easy to learn or fast to do. Hopefully some more players will notice the distinct lack of addon developers and replace them. I would also like to see advanced quest book updated, or something similar, and put on curse. AQB in particular is extremely useful for new players and for just general questing, and there have been quite a few people asking around for a "questing addon" recently.
