Quests

The Demon Oak
No longer requires the 6,666 demon task, but difficulty is greatly increased. Also uses an older method of gaining access to the Demon Oak requiring you to step on the tiles shown in the following pictures.

Children of the Revolution
No longer requires four players to complete.

Royal Rescue/Hidden City of Beregar
During the quest for Emperor Rehal, most of the quest is scrapped. All you need to do for the quest is obtain 50 bunches of troll hair and a bricklayer's kit, anything else the wiki lists is not necessary

Secret Service Quest
During Mission 6 for the CGB (getting the book from Isle of Kings), the quest box does not work. Instead, kill the skeleton located in the room to obtain the book.