I agree, start by read some of the great Spark articles on how to break a plateau. www.sparkpeople.com/diet-resources.asp?t=p
Don't assume something is wrong because your weight loss hits a slow point. As the old song goes,"accentuate the positive and eliminate the negative". You haven't gained any weight back. That's says you are doing something right. Why isn't the scale moving ? Not an easy question to answer.
One thing to consider is whether or not your body is stuck in a rut i.e. doing the same thing day after day after day. The human body thrives on change and challenge. So, if you've been doing the same workout every day, it's time to try something new. Mix it up. The same is true of the foods you've been eating. Try adding more varieties of veggies. Try having more fruit.
Variety, it's the spice of life !