So I have been riding my new bike for about a week now. I have this bottom bracket :

http://www.nashbar.com/bikes/Product...3#ReviewHeader

Today, out of nowhere, I started getting some fairly loud creaks coming from the bottom bracket area. It happens at a certain point on every rotation, and happens mostly when I am pedaling forcefully (ie. starting after stopping at a light) but it is very obvious and is driving me insane. I have removed the cranks and BB, re-installed and tightened everything. Also tightened all the stack bolts on the chainring. This fixed it for about 10 minutes, then it started again. Any ideas?