Sometimes Dms possess boss monsters on scripted quests. If the DM doesnt unpossess the boss in time before you kill it, then you will not receive the quest update. Then when you go back to the questgiver, it wont give you the option of finishing.
Never Fear!
Sometimes this happens and we as DMs dont think about it, or, as tonight, I crash out and forget. Immediately notify your benefactors (a DM) if you kill a boss monster and you do not receive a quest update in your journal. It can be fixed through OOC considerations. As for the sexual reproductive repression field, you'll get your mojo back when we feel like it.
This has been a Breencast, dah I mean, Bearcast.