SuperGuyDaddy - type /stopcast when you get in a spot like that. Usually auto attack, looting and everything is all messed up. Also you might want to watch looting lore items, it will cause everything to lock up. That is solved with /stopcast.
I can also think of when you augment an item it gets stuck just type /stopcast and it will pop it into your cursor. Check out our server btw, we are pretty pimp custom. In open beta currently, but it's still fun. When it releases, it should have about 3-4 months of custom quests and monsters to kill. We have revamped Innovation and zones like that. S2K, Crisco were too unbalanced so now we are working on class balancing. We have also balanced pets and spells so each class is made the way they should be on an mmorpg. When we go live I will let everyone know. It is a real blast.