I havnt been able to fully figure it out, but this is what I have tested so far.
Use a consumable item (I was playing with Wind Bolts), use it on a few mobs, warp (Could even be into the same spot), try using the bolt again. Do it a few times and eventually the bolts will be confumed but the skill will not be casted. Only way to start casting again would be to re-log
I recently tried this with Anodyne without Warping and at some point it also stopped casting Endure.
Update 1: The issue occurs on a per-item basis. Consuming a "non-broken" item seems to fix it for the previously "bugged" item
Update 2: Apparently this occurs with targetting items that I belive) should be on a delayed consumption and get "consumed" twice.
Ex.: Use a Bolt Scroll, get the targetting ring, use the Bolt scroll before hitting the target, and the scroll will not work again.
Finally, looks like delayed consumption type is broken :P
This post has been edited by
Xgear
on May 15, 2013 18:25