Lv.10 Archer Quest "Training with Leih" BUG

[1clou]

During the Level 10 quest "Training with Leih" when you are instructed to destroy 6 targets, 5/6 the six can be downed, while there is 1(one) that regardles of positioning, distance and ability used the notification "Invalid Target" appears when attempting to initiate any skill(Heavy Shot included) upon it. Switching to any other class and using Area of Effect skills does not bare fruit. Switching to other jobs does not work. Shutting down and restarting the client does not work, logging off does not work, Abandoning the quest and attempting again leaves the same target unable to be inflicted with an action due to "Invalid Target". Several other players have had same issue, occurred approximately 3 hours ago and ongoing. The Target is always the same, it is the target on the top of a rock on the one side of a tree by the mouth of a river in Central Shroud.

Will post a Video of the bug in question as soon as possibly viable.

[EDIT]

ISP: Sasktel

Type of Internet Connection: Other

Internet Connection Speed: 10mbs

Date & Time: ~12 PDT - ongoing ~ November 14/2013

Frequency: Ongoing
Always, Archery Butt by mouth of river on top of the rock by the tree in Central Shroud

PC or PS3: PC, Windows 7

Character Name: Cloudi Strife (has happened to others in the itme i was having issue, did not record names)

Race: Hyur F

World: Excaliber

Class: Archer 10~

Area and Coordinates: Central Shroud, 20,17 on top of rock by tree(West side) near river

Party or Solo: Both, solo and with 1 and 2 others

NPC: none/Archery Butt

Monster Name: Archery Butt

Ingame time: any time

Steps:Quest instructs you to destroy 6 targets in Central Shroud with Heavy Shot. Destroyed targets with Heavy shots for 5/6 targets, 6th target in same spot on the rock always comes up with notification of "Invalid Target" consistently without fail regardless of angle, job, ability, or weapon used. Resetting user client, game, logging off, changing class and various abilities, aborting quest and destroying targets in different order does not alleviate the issue with the same target in same spot.