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I am at the point where the two apprentices, Kelkemello and Saturius, have to perform three challenges in order to become the new court wizard.
However, at the second challenge the quest does not continue. After telling Caros Cocceius that the two apprentices are ready for the second challenge, Kelkemello fails to summon anything once the prompt is given. At this point, any dialogue with either Caros Cocceius or Kelkemello is locked, and I'm only able to say 'Goodbye' so I can close the dialogue screen.
I do have to add that prior to starting the second challenge, that I did talk to Saturius first, so I could taunt Kelkemello into summoning something greater than a Daedroth. I have not tried yet if he could summon the Daedroth by not taunting him.