[666maslo666]

Make an Alpha wing with player as Alpha 1, then disband it and save. The mission will break and you wont be able to move or shoot.

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[FUBAR-BDHR]

Well you have the player arrival still set to false so that would most likely be the cause here.   

Maybe FRED should reset the arrival of ships that are player starts to true when the wing is disbanded.

[karajorma]

On one hand, it's a bug. On the other hand, if the player ship isn't in a wing, the mission still won't work.

[mjn.mixael]

Doesn't FRED say something when you save a mission where the player ship is not in a wing?

[Goober5000]

Well you have the player arrival still set to false so that would most likely be the cause here.   

Maybe FRED should reset the arrival of ships that are player starts to true when the wing is disbanded.

Might as well set the arrival cues of all ships -- not just players -- to true when the wing is disbanded.

Doesn't FRED say something when you save a mission where the player ship is not in a wing?

Yup.