What do you do when your great business idea starts to feel not so great?

This is the issue I have been facing for the past couple of days. I have been working with Startup.SC, a South Carolina startup business incubator, on a new business concept called Yumbev, a unique-craft brewing-business model I am hoping will capitalize on the craft-beer boom in the U.S.

I have validated the business idea, but for the past couple of days, the idea has stalled. It is not a lack of motivation, but rather a nagging hunch that I am missing something -- something rather significant.

It is a feeling I know every startup entrepreneur has at some point.