I think part of it has to do with how close you are to goal... the scale moves a lot slower for me these days since I've gotten so close.
And I wouldn't exactly call 2 weeks a plateau, I think sometimes your body needs some time to adjust to weight loss and it might hold onto some weight for a while. I went through a 3-month stall once and was soooo frustrated, but I'm so glad I kept at it. Give it time, keep up the good work, and it'll start moving again. You can do it!
Monkey