The problem I've always had with writing fic is actually completing it. I get so far and then I stagnate and I don't know if it's because I get bored, or it's because inevitably there's always 2 more plot bunnies that come hopping by and distract me from my original task.
I've got a Draco fic in the works and so far I've got 1969 words and it's only gotten to the PG rating at the most. As it is, I don't know how I should continue it - or rather, I DO know where I want it to continue but not sure if I'm on the right track...
*grumbles*
I never have this problem in my RPGs - normally you can't shut me up.
ETA: I just finished ordering Season 1 of Supernatural, which was 67% off at Amazon.com as well as a copy of Hot Fuzz. I love Simon Pegg. I want to put him in my pocket :D