Here is a very small test scenario to see what is happening when plane units of a group refuse to land. Attached is a last moments save before planes of one group get stranded.
The procedure is to launch 3 AC group of 3 AC each. I sent then one north, south and west. I then sent the norther group home without separating group.
I then sent one home but divided it into 3 single AC groups.
I then separate the third group and sent each AC group home but right after joined them back into a group with three separate one AC units. I then sent it home to land
My results were the first group landing without problems.
The Single AC groups land without problems.
The third group which was divided the reunited landed only the first AC unit but stranded the last two AC units till separated or ROF.
I believe after testing the problem occurs with the rejoining groups only regardless if land or sea base landing.
I also made a save with larger amounts of aircraft label with m.
Oops forgot HCDB (150928) GK2003 BS
Landing test Scenario.zip
TESTm.hpm