Hey Holger, a few things.
There is only one flight app, the free one. There are different tiers of processing and various back office options.
The new version of the app has been having various high processor use problems which have begun to see some resolution based upon feedback in the forum.
But there are reported bugs with live feed disconnect and flight plan loading in the field. It seems to be that the app is querying DD’s servers, or trying to, in the field. The app is still supposed to work without a data connection. But there is definitely something going on that wasn’t in v. 3
DD is focused on pushing the app beyond just flight control. They will beta test with the user base and then work on solutions. If you want to continue using the DD app you best be prepared to use the newest, fastest devices, and put up with some blips when they write-in new “improvements”. I personally think if they should keep a light, bulletproof flight app and develope another “Drone Deploy Cloud interface” app if that’s what they want. But I don’t get a vote !
I would suggest that you look into a couple of the other flight apps to fill out your tool kit. It’s a good idea even when things are working well because the next update, it may not. That kind of goes for all of the apps, but it is certainly true of DD Flight.
I would suggest Map Pilot (Paid) and Pix4d Capture (Free)