I started a new file, and in this one I wanted to join the mages guild, and anyone who has joined before knows that you need a recommendation from each guild in order to advance in rank. Well for the Bruma mages guild recommendation you need to make J'skar appear. in order to do that you have to pull a prank for a guy named volanaro. He wants you to steal the guildmasters manual of spellcraft from her desk, then you have to take it to volanaro, who says "have you pulled that prank yet?" except there is no option in the dialogue to give him the book or even talk about the quest, so there is no way to finish the quest. Is there anything you can do to get around this, through the console or something?
Find yourself a life detect spell as well as a dispel target spell, use the life detect to find J'skar and the dispel to make him visible. This will give you the option of completing the quest through J'skar rather than Volanaro.