Update: Rift 1.6 Hotfix 1

EMBER ISLE

 * Fixed a timer issue with the zone events Ithkus' Rise and In Golden's Grasp so the events won't time out or fail prematurely.
 * Zone Event: Fires of Rebirth: Scerrion should more reliably transform during this event.
 * A New Threat: Moved the location of one of the Sourcewater Basins away from Fort Zarnost.
 * An Unexpected Revelation: Fixed a case where the Pyrkari Altar could become unusable.
 * Clear a Path: Objective text now refers to the correct object name.
 * Lurking in the Mist: Moved one of the summoning circles out from beneath a tricksy rock.
 * Dissection, Look Again, Mindtwister: Increased the respawn rate for these quests' targets.
 * The Miasmic Tide: Reduced the damage dealt by Diseased Keepers to the Miasmic Conches.
 * Target Practice buffs won't stick around forever anymore.
 * Several general cases of quest objects and mobs with slow respawns have been addressed.
 * Players completing the twisted artifact collection for Ember Isle now receive a title for their efforts!
 * All mobs brought to Telara through the new Ember Isle Raid Rifts should now properly despawn when the Rift is closed.
 * Corrected the new water reflections on Ember Isle so they no longer show objects that shouldn't be reflected.
 * Fixed an issue causing the Fell Fields lava to disappear on low video settings.

CADUCEUS RISE

 * Fixed the Caduceus respawn bug in all versions of this dungeon and he should be available again after this update!
 * Upper Caduceus Rise [Expert]: Killing Cinderstorm will properly award credit toward the achievement Expert: Caduceus Rise.

ASCEND-A-FRIEND UPDATES

 * The Ascend-a-Friend window will no longer open with an empty URL display.
 * Check marks now display properly in the Ascend-a-Friend window.

GENERAL

 * Hammerknell: Bloodplague Crawlers no longer grant experience.
 * Greenscale's Blight: With twice the heart - and twice the corruption - of your average dragon, Lord Greenscale now drops two of the Life or Death Saga quest items when slain.
 * Scarlet Gorge: Zone Event: Fires of Suffering: Fixed an aggro issue with General Argonis which allowed him to die prematurely and break the event.
 * PvP: Fixed a bug that caused certain proccing abilities to not work properly in PvP if they were originally activated on a character that was not PvP flagged.
 * Warfronts: Fixed a bug where balanced matches were sometimes not triggering a map when they should have been.
 * Creatures that can be Mined or Foraged no longer drop resources 100% of the time.
 * Enigmatic Deepstones now stack with other Essences, and are no longer Bind-to-Account.
 * Some weapon models weren't appearing properly in combat - fixed the displays on these!
 * Invalid 'default stage' Rifts will no longer appear randomly in zones.
 * Server stability enhancements.

Source
http://forums.riftgame.com/official-rift-news/patch-notes/279644-rift-1-6-hotfix-1-8-00am-pdt-11-18-11-na-2-00am-gmt-19-11-11-eu.html