If you do not see the bug on this list please list it below in the comments I will try to keep this as updated as I can. Before you post your bug most quests bugs will fall under general bugs. Also please post what Operating System you are using in your post!

(PC) Non-Interactive bug: Objects that appear in game unusable or select-able via normal(or any) method, aka interact.

(PC) Invisible objects: Objects that are normally interactive are either invisible or invisible and non-interactive. This bug often shows auras/particle affects for the object but not the object itself; such as collectible crafting items(ore,plants,runes ect), quest items/objects. This bug USUALLY can be temporarily be resolved via a re-log of the user account(log out->log back in) no game client restart necessary in most cases.

(PC) Unresponsive Ability Activation(not net lag): Using an ability does not result in the activation of the ability. This occurs both with weapon drawn and sheathed. Some times it can take upwards of 10 seconds for the ability to activate. This bug happens when, and is not resolved by, a single depress and repress of the button or through spamming of the ability keybind occurs.

(PC) Weapon Swap on Sorcerer Storm calling Ult activation: I have not thoroughly tested this with all weapons but with a restoration staff and a destruction staff equipped and the Storm calling ultimate on BOTH weapon sets when activated the game automatically switches to the destruction staff.

(PC) Depth of Field messing up some abilities animation particle affects. Making them show up where they are not supposed to be EX: Destro Staff Wall of Elements