Thanks for your mission shows up and plays just fine. I am also running the latest patch through steam (UK).
The mission I sent you and the other mission I created still do not show up so I created another simple take off and landing mission and now that one does show up (all confused). Maybe its because they were created pre patch I don't know but as long as they keep showing up in Single Missions then I will get on to creating some proper missions. Not sure what all the new stuff (over and above 1946 FMB) does yet but but I will find time to get my teeth into it now I know they will show up to play.
Thanks again m8.