Hi @JulianOes I have the same Problem (using first 1.9rc):
I loaded a Mission including a Takeoff Point. I switched to Mission and wanted to Arm but it refused, complaining that I first need to switch to a manual Mode. (Check the following Log Messages when I tried to do so: https://logs.px4.io/plot_app?log=6cabfaba-9ebd-4c1a-9df2-53d01c410b15)
This was the Mission:
