Most of players probably cannot play game, it is cos IA updated AION to 2.1. I tested it, I will tell you how I fixed it. I started NCSoft launcher and updated it till end, then I downloaded IA launcher and placed it in game folder, I started it and that's it.
Now this is what they said on IA forum about update:
" 1. 2.1 is here. This includes items, titles, skills, npc updates, etc.
2. Fixed it so that dispel ignores toggles (though, it should have before, this is just an additional safety check).
3. Possible fixes for some legion stuff.
4. Bonus damage is no longer boosted by magic boost. This apparently was done in 1.9. Skills like Lightburst and Shadowburst will be most noticably affected.
5. Added geodata checks for knockbacks to prevent falling through the ground.
6. Initial implementation of restocking system for item vendors.
7. Fixed summon group member so it ignores LoS requests.
8. Added about 3k npc skills.
9. Added a possible fix for the daeva weapon exchanger giving players the auction house window.
10. Added a possible fix for pulling npcs with skills like Doom Lure.
11. Added a possible fix for getting stunned while resting.
12. For some reason certain summon types weren't going into combat while attacking and thus got retarded amounts of regen. Should be fixed now.
13. Fix added to prevent people from logging out before a fort goes vuln then logging back in when the deity has spawned.
14. Fixed it so that npcs whose corpses should disappear immediately will no longer wait the 30 second minimum for empty loot corpses. More efficient this way too.
15. Fixed the amount of supplements required to improve items.
16. Fixed some possible exploit fixes with soul bound items and whatnot.
17. Initial implementation of NPC pathing. (Toasty is a liar, this didn't get completed yet)
18. Fixed non-summons (traps, etc) so they won't aggro surrounding mobs.
19. Fix for double broadcasts in party/alliance.
20. Initial work on siege weapons.
21. Added support for multiple polymorph effects.
22. Misc quest work, will let Alleta fill this in.
23. Fixed all the floating gatherables using geodata.
24. Fixed all floating npcs that should not be flying.
25. Fixed a few things you don't care about.
Because of 2.1, a lot of improvements were made to the server overall and we don't need to detail those fixes. But that's why this list appears short for the amount of time between the last update (plus Thanksgiving holiday). "