1. Not enough vegetables/carbs.
I had been doing 25g carbs for a while but many days I wasn't getting nearly that. I would eat mostly meat and not many veggies. I learned my lesson - veggies are important! I made sure to get around 30g carbs for a day and went from 234 to 226.5 in two weeks.
I hate to say it, but I think that's bad for me. I may need to do more trial and error to see, but I avoided it the past two days after being stalled for a bit and went down a pound this morning. I'll miss the diet soda and candy bars, but oh well.
So if you're stalling out... those two things might work for you. They worked for me!
x-posted to atkins_diet