I was on the X-Wing Mission Control site, signed in and was sent to the Descent version.

Thanks for the note, but the system wouldn't allow me to reply. I couldn't recreate it today as I was forced to log in before I could go to the Mission Beta site. Yesterday I had clicked on the Mission Beta, watched the video, clicked on My Missions (mostly to add my collection) and when I was instructed to log in first, it then took me to Descent.