To be clear this is the first reported issue of this happening. I will not mention another large brand name manufacture who's tx's all defaulted there GUID's to zero's effectively allowing any of there tx's to take control of another rx.
Granted this should not have happened it the first place however FrSky is addressing the issue on the first occurrence of this. Not many manufactures address issues like this on the first occurrence.
No system is perfect as much as we would like them to be.
However until FrSky comes out with an official fix it would pay just to be on the safe side and ground check your models before flying if there are multiple FrSky users about especially with new club members or people who have new tx systems.
I have a more detailed thread which FrSky is watching and will take part in if you have any questions around this issue. http://www.parkflyers.org.nz/modules/ne ... mpost28466
Further to note not only would the system have to be on the same GUID for this to happen but on the same set of Freq channels. Due to this being a large flyin and the Spectrum range was fairly full it would not have helped them finding a free spot in the band and would have compounded the issue. If it was just the two of them flying we would most probably never have seen the issue, that would have been far worse as the issue would not have been seen and not addressed.