Made several complex missions for the BETA version, but two of these became too unstable to use. I normally found that instability is introduced by changing flight roles, and then changing the weapons, was the cause of most instability. So you remove all weapons, then change the flight role, then give it a new loadout for that role. But that did not work with the BETA, nor did deleting flights or objects seem to help.
Loaded those same missions into the released version and saved them, and those missions are working and stable again.
I like how the editor now 'reality-checks' things within missions; like say if you changed a role, any legacy settings that were particular to that now defunct role, which were made invalid by the role change, are now flagged and a warning given when saving. Tells you which waypoint has issues or invalid commands. Concisely alerts you what's wrong, where, and why.