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Can I use Hana Flv Player in my commercial website?

Yes. All the flash players are under GPL licese and you are free to use them in a commercial website.

I would like to save my bandwidth as best as possible. What settings would guarantee the minimum usage?

Set autoplay and autoload to false in default setting admin page. You can override default by defining attributes inside the hana flv player tag.

While other players are working, Flow Player 3 is not working. What's wrong?

I found that when you use the FlowPlayer v2 (old) and v3 (new) at the same time within the same post, FlowPlayer 3 is not working properly sometimes. This must be caused by the the javascript confict between v2 and v3. For now, just use the same version for all the videos in a post.