Writing is a weird process. You limited by a lot of factors, in terms of developing the right scenes from your head to the paper/screen, the words you choose, the time you have, annd yet you're limitless in what you do. But when you hit that slump . . . there's nothing to pull you out. Temperamental, I'd say.

Though, like was mentioned in your LJ, roleplaying, is a valid writing/fanfic form. At least, to me anyway. Whatever gets the muse going.