Hmmm--I would think you'd be losing pretty steadily. But, plateaus to happen sometimes. Generally changing "something" will help break one. Change exercise, eat a little differently, that sort of thing.
How's your calorie mix, for instance? I had a little plateau some time ago and cut out some empty carbs and the loses started right back up. I like to keep a 40/30/30 carb/protein/fat mix but every body processed food differently so YMMV. If you're a bit high on carbs, you might try bumping up your protein a bit--just a thought.
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.