I'll look into it.
Well here's a twist in things.
I was thinking, usually a bad idea for me, and got to wondering what might have caused the problem. So I set up the original Pony vs Pony mission that HTC gave us originally. Lo and behold, the Lead instructions and warp didn't work for that mission either. I have never altered the onevsone file that goes with that mission so I began wondering what pray tell was going on.
I decided to uninstall and re-download and install AH. Did this. It left the offline missions folder in place but reinstalled the rest of the game. Still no joy. Went into the offline mission folder and deleted everything except the onevsone mission file. Restarted AH. Selected the mission. Everything worked fine.
Interesting. So next I redownloaded the Mossie vs Pony mission that you put together for me. Started AH and selected the mission. Viola! Working as intended.
So, this apparently leads me to believe that there is a flaw in one (or more) of the "user" created missions that I have previously downloaded. On top of that, apparently the game loads something from each of the Offline Missions when you start AH in Offline Mode. And something in one of the missions is screwing the pooch, so to speak, on start up.
I haven't yet had a chance to test each of the missions you made for me one by one yet, hoping to do that later. But, I am suspicious of one or more other missions that I had downloaded previously but not yet run more then the simple missions you built for me.
I'll keep you posted.
EDIT TO ADD:
Success! I re-downloaded the missions you made for me one at a time, testing each before downloading the next. All of the missions that you made for me are working correctly now. So the problem is apparently resident in one of the other missions that folks have posted up in here. I'm not certain which one it is yet, but it is definitely not one of the missions that you constructed for me.
And for anyone who is not getting the "Lead" directions or the warp, I suggest deleting all of the missions that you have downloaded and reinstalling them one at a time testing as you go, until you find the culprit.