Yes it's true sort of... After the first launch during the ladder task at our contest on Sunday, I realized I had no elevator control.
The plane started downward at a steep glide and with full elevator stick I was not able to level it out so I circled it back to the field for a hard landing luckily not hitting anyone or anything.
Don't ask me about flaps...I was petrified. It did a long slide to a stop undamaged and I immediately switched planes. I managed to get the 1:45 but not enough time left for the 2:00 but I still won the round!
So inspection showed that the elevator pushrod had come out of the control horn! The reason was because the h-stab guide pin at the LE was a tiny bit loose... this allowed the entire assembly to rotate on the mounting bolt when I launched. It only needed to rotate a couple mm (with the help of launch force) to disconnect itself from the pushrod.
So a little CA got the pin fixed and the stab re-centered, and in an effort to minimize the possibility in the future, I did two things. First I added a small piece of double-stick to the most-aft part of the stab pylon, then after re-attaching the assembly, I put a tiny ball of GOOP on the end of the pushrod so it can't slide out of the horn. (Suggested by my good flying buddy John Lovins. Thanks John!)
I don't recall bumping the h-stab against anything hard enough to loosen the pin... maybe it was an un-noticed mid-air tap...I don't know, but CX2 pilots should give their h-stabs a wiggle right now to make sure they're tight. I got lucky.
I'd like to hear if you guys have any better suggestions.
P.S. These awesome CX2s performed superbly for me at the contest. I'm happy.