hello
with 2020.4 nightly, a window appears (but not always) when launching many helicopters (but not all), regardless of location:
"The aircraft flight dynamics model contains errors and cannot be used. (FGGroundCache::get_agl:NaN position input") Quit FG
Log shows many warnings such:
18.09 [WARN]:OSG /Users/jenkins/jenkins-root/workspace/Mac-nightly/dist/include/simgear/debug/OsgIoCapture.hxx:37: Warning: detected OpenGL error 'invalid operation' after applying GLMode 0xde1
18.09 [WARN]:OSG /Users/jenkins/jenkins-root/workspace/Mac-nightly/dist/include/simgear/debug/OsgIoCapture.hxx:37: Warning: detected OpenGL error 'invalid operation' after applying GLMode 0x806f
???? THK for answering