I am particapting in the thread at http://www.sitefinity.com/developer-network/forums/bugs-issues-/corrupted-license-file-for-small-business-edition .
Samir created a post. I closed my browser. Did a little research. Re-opened my browser and the post I was responding to disappeared. This is a recurring problem and it always seem to re-appear after a few hours. This has happened a couple of times over the last few weeks.