I wouldn't worry. As long as the new top growth looks healthy and green, you're fine. In my experience, when lower leaves drop on a healthy plant, and the temps/watering are right, the bottom will kick out new growth too eventually. If you have enough season left, it can mean an even bigger...
Just received my sfrb of red fatalii that I won in a contest held by Dr. Pepper. Found in this thread:
http://thehotpepper.com/topic/56438-closed-who-wants-a-sfrb-o-fataliis-contest-closed/
Let me just say that it's a good sign when you shake the box and there is absolutely no rattling going...