"The same problem occurs here. I did some flights last week and everything worked fine.
Today I tried a new mission and this problem appeared.
I'm using UgCS 2.10.1058, Android 5 with App 2.3.211 and Phantom 3 Advanced."
we permanently update our beta and fixing issues but for PX4 is still a few things that needs more testing. I'll write you when will be sure that it ready.