Hello Out There! Anyone Home?

I recently got a few of my books up and running in DTB (paperback) and a couple more at Smashwords which allows greater distribution and more e-format downloading options. However, Smashwords has stopped selling for me altogether. I've gotten no sales according to my reports since early May. I wrote to them because I keep seeing numbers of downloads change though I see no sales. The answer was that they were working on it.
Working on what? I wonder. Some of my fellow authors, Mr. Patterson...