Confused...

I was already active but wasn't working out at all. My part time job has me on my feet on weekends and some weekends I would track 80-100K steps on my pedometer, so I'm not sedentary. Last year, I lost 15 lbs in 2 months for a wedding/cruise and maintained it until October 2012 when I hurt both my feet and couldn't work out as much. I gained 10lbs back through the holidays while my feet were healing.

Here is my issue...my feet are now better (ish) so I've been working out pretty hard for the past 10 days. An hour of Zumba 5-7 days per week plus light strength training such as push ups, sit ups, lunges and squats. Body resistance stuff.

I've cut down to the suggested 1200 net calories per day and I eat my exercise calories back 90% of the time. Sometimes I just am not hungry and refuse to eat 200 calories right before bed because I'm short.

I've lost ZERO pounds in 2 weeks.

As for diet...I don't drink soda, I drink 80 ounces of water minimum per day and occasionally treat myself to a semi-sweet tea (calories included in my tracker). I'm eating 2 snacks of fruit per day and eating high protein healthy meals. A typical day is:
Breakfast - a protein shake (I eat in the car and its quick and easy)
Snack - a banana or apple with peanut butter
Lunch - a tuna fish sandwich on whole grain deli thins with minimal low fat mayo (1/2 tbsp), brown rice and broccoli or other green veggie, no butter
Snack - granola bar or fruit
Dinner - Lean Protein (salmon or grilled chicken) with lots of veggies and sometimes a small starch (sweet potato, 1/2 baked potato butter only)

I do ocassionally have a glass of wine or two on the weekends, but I include it in my tracker and don't exceed my 1200 net calories per day.

How is it that I'm not losing anything?!?!? Every website I've looked at says I may be consuming too few calories, but 1200 is what MyFitnessPal says I should be eating.

Any tips or advice?