#0 - Sept. 17, 2010, 5:42 a.m.
Recent faction change bug?
#1 - Sept. 17, 2010, 6:09 a.m.
Per our Faction Change FAQ: http://us.blizzard.com/support/article/28825
Q u o t e:
What will happen to the character's quests when I change its faction?
Quests which are active in the character's log at the time of the Faction Change will be cleared and all quest items associated with these quests will be destroyed.
With this, completed quests that are considered faction-specific—or are faction-neutral and part of a quest chain—will be removed from the list of completed quests and no longer count towards any running "quests completed" totals. Standalone faction-neutral quests will be unaffected by this process and remain in the character's list of completed quests. Should you ever elect to change back to the character's original faction, the original list of completed quests will be restored.
**Please note that quest lines associated with Sons of Hodir, the Shadow Vault, and the Argent Tournament will be reset. To regain access to the dailies associated with these factions, the character will need to re-complete the appropriate quests. This can also include faction-specific plot quests such as the Battle for Undercity, which will be available with the new faction.**
It does not appear that Knights of the Ebon Blade are actually hostile to you, as you are still exalted with them - but I imagine the NPCs at the Shadow Vault have reset to the followers of the Lich King, who would, indeed, be hostile to you.